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$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 120 } = 0$

$acx^{2} + \left(ad + bc\right)x +bd = \left(ax + b\right)\left(cx+d\right)$

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 15 } \right ) \left ( \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 8 } \right ) = 0$

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 15 } \right ) \left ( \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 8 } \right ) = \color{#FF6800}{ 0 }$

$ $ If the product of the factor is 0, at least one factor should be 0 $ $

$\begin{array} {l} \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 15 } = \color{#FF6800}{ 0 } \\ \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 8 } = \color{#FF6800}{ 0 } \end{array}$

$\begin{array} {l} \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 15 } = \color{#FF6800}{ 0 } \\ \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 8 } = \color{#FF6800}{ 0 } \end{array}$

$ $ Solve the equation to find $ x$

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ 15 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 8 } \end{array}$

$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 120 } = \color{#FF6800}{ 0 }$

$ $ Convert the quadratic expression on the left side to a perfect square format $ $

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 120 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } = \color{#FF6800}{ 0 }$

$\left ( x - \dfrac { 7 } { 2 } \right ) ^ { 2 } \color{#FF6800}{ - } \color{#FF6800}{ 120 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } = 0$

$ $ Move the constant to the right side and change the sign $ $

$\left ( x - \dfrac { 7 } { 2 } \right ) ^ { 2 } = \color{#FF6800}{ 120 } \color{#FF6800}{ + } \left ( \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } }$

$\left ( x - \dfrac { 7 } { 2 } \right ) ^ { 2 } = 120 + \left ( \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } }$

$ $ When raising a fraction to the power, raise the numerator and denominator each to the power $ $

$\left ( x - \dfrac { 7 } { 2 } \right ) ^ { 2 } = 120 + \dfrac { \color{#FF6800}{ 7 } ^ { \color{#FF6800}{ 2 } } } { \color{#FF6800}{ 2 } ^ { \color{#FF6800}{ 2 } } }$

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } = \color{#FF6800}{ 120 } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 7 ^ { 2 } } { 2 ^ { 2 } } }$

$ $ Organize the expression $ $

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } = \color{#FF6800}{ \dfrac { 529 } { 4 } }$

$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } \right ) ^ { \color{#FF6800}{ 2 } } = \color{#FF6800}{ \dfrac { 529 } { 4 } }$

$ $ Solve quadratic equations using the square root $ $

$\color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } = \pm \sqrt{ \color{#FF6800}{ \dfrac { 529 } { 4 } } }$

$\color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 7 } { 2 } } = \pm \sqrt{ \color{#FF6800}{ \dfrac { 529 } { 4 } } }$

$ $ Solve a solution to $ x$

$\color{#FF6800}{ x } = \pm \color{#FF6800}{ \dfrac { 23 } { 2 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 7 } { 2 } }$

$\color{#FF6800}{ x } = \pm \color{#FF6800}{ \dfrac { 23 } { 2 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 7 } { 2 } }$

$ $ Separate the answer $ $

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 } { 2 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 23 } { 2 } } \\ \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 } { 2 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 23 } { 2 } } \end{array}$

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 } { 2 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 23 } { 2 } } \\ \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 } { 2 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 23 } { 2 } } \end{array}$

$ $ Organize the expression $ $

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ 15 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 8 } \end{array}$

$x = \dfrac { \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } 7 \right ) \pm \sqrt{ \left ( - 7 \right ) ^ { 2 } - 4 \times 1 \times \left ( - 120 \right ) } } { 2 \times 1 }$

$ $ Simplify Minus $ $

$x = \dfrac { 7 \pm \sqrt{ \left ( - 7 \right ) ^ { 2 } - 4 \times 1 \times \left ( - 120 \right ) } } { 2 \times 1 }$

$x = \dfrac { 7 \pm \sqrt{ \left ( \color{#FF6800}{ - } \color{#FF6800}{ 7 } \right ) ^ { \color{#FF6800}{ 2 } } - 4 \times 1 \times \left ( - 120 \right ) } } { 2 \times 1 }$

$ $ Remove negative signs because negative numbers raised to even powers are positive $ $

$x = \dfrac { 7 \pm \sqrt{ 7 ^ { 2 } - 4 \times 1 \times \left ( - 120 \right ) } } { 2 \times 1 }$

$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 \pm \sqrt{ 7 ^ { 2 } - 4 \times 1 \times \left ( - 120 \right ) } } { 2 \times 1 } }$

$ $ Organize the expression $ $

$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 \pm \sqrt{ 529 } } { 2 \times 1 } }$

$x = \dfrac { 7 \pm \sqrt{ \color{#FF6800}{ 529 } } } { 2 \times 1 }$

$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $

$x = \dfrac { 7 \pm \color{#FF6800}{ 23 } } { 2 \times 1 }$

$x = \dfrac { 7 \pm 23 } { 2 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } }$

$ $ Multiplying any number by 1 does not change the value $ $

$x = \dfrac { 7 \pm 23 } { \color{#FF6800}{ 2 } }$

$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 \pm 23 } { 2 } }$

$ $ Separate the answer $ $

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 + 23 } { 2 } } \\ \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 7 - 23 } { 2 } } \end{array}$

$\begin{array} {l} x = \dfrac { \color{#FF6800}{ 7 } \color{#FF6800}{ + } \color{#FF6800}{ 23 } } { 2 } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$ $ Add $ 7 $ and $ 23$

$\begin{array} {l} x = \dfrac { \color{#FF6800}{ 30 } } { 2 } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$\begin{array} {l} x = \color{#FF6800}{ \dfrac { 30 } { 2 } } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$ $ Do the reduction of the fraction format $ $

$\begin{array} {l} x = \color{#FF6800}{ \dfrac { 15 } { 1 } } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$\begin{array} {l} x = \color{#FF6800}{ \dfrac { 15 } { 1 } } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$ $ Reduce the fraction to the lowest term $ $

$\begin{array} {l} x = \color{#FF6800}{ 15 } \\ x = \dfrac { 7 - 23 } { 2 } \end{array}$

$\begin{array} {l} x = 15 \\ x = \dfrac { \color{#FF6800}{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 23 } } { 2 } \end{array}$

$ $ Subtract $ 23 $ from $ 7$

$\begin{array} {l} x = 15 \\ x = \dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 16 } } { 2 } \end{array}$

$\begin{array} {l} x = 15 \\ x = \color{#FF6800}{ \dfrac { - 16 } { 2 } } \end{array}$

$ $ Do the reduction of the fraction format $ $

$\begin{array} {l} x = 15 \\ x = \color{#FF6800}{ \dfrac { - 8 } { 1 } } \end{array}$

$\begin{array} {l} x = 15 \\ x = \dfrac { - 8 } { \color{#FF6800}{ 1 } } \end{array}$

$ $ If the denominator is 1, the denominator can be removed $ $

$\begin{array} {l} x = 15 \\ x = \color{#FF6800}{ - } \color{#FF6800}{ 8 } \end{array}$

$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 120 } = \color{#FF6800}{ 0 }$

$ $ Determine the number of roots using discriminant, $ D=b^{2}-4ac $ from quadratic equation, $ ax^{2}+bx+c=0$

$\color{#FF6800}{ D } = \left ( \color{#FF6800}{ - } \color{#FF6800}{ 7 } \right ) ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 1 } \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 120 } \right )$

$D = \left ( \color{#FF6800}{ - } \color{#FF6800}{ 7 } \right ) ^ { \color{#FF6800}{ 2 } } - 4 \times 1 \times \left ( - 120 \right )$

$ $ Remove negative signs because negative numbers raised to even powers are positive $ $

$D = 7 ^ { 2 } - 4 \times 1 \times \left ( - 120 \right )$

$D = \color{#FF6800}{ 7 } ^ { \color{#FF6800}{ 2 } } - 4 \times 1 \times \left ( - 120 \right )$

$ $ Calculate power $ $

$D = \color{#FF6800}{ 49 } - 4 \times 1 \times \left ( - 120 \right )$

$D = 49 - 4 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } \times \left ( - 120 \right )$

$ $ Multiplying any number by 1 does not change the value $ $

$D = 49 - 4 \times \left ( - 120 \right )$

$D = 49 \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 120 } \right )$

$ $ Multiply $ - 4 $ and $ - 120$

$D = 49 + \color{#FF6800}{ 480 }$

$D = \color{#FF6800}{ 49 } \color{#FF6800}{ + } \color{#FF6800}{ 480 }$

$ $ Add $ 49 $ and $ 480$

$D = \color{#FF6800}{ 529 }$

$\color{#FF6800}{ D } = \color{#FF6800}{ 529 }$

$ $ Since $ D>0 $ , the number of real root of the following quadratic equation is 2 $ $

$ $ 2 real roots $ $

$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 120 } = \color{#FF6800}{ 0 }$

$ $ In the quadratic equation $ ax^{2}+bx+c=0 $ , if the two roots are $ \alpha, \beta $ , then it is $ \alpha + \beta =-\dfrac{b}{a} $ , $ \alpha\times\beta=\dfrac{c}{a}$

$\color{#FF6800}{ \alpha } \color{#FF6800}{ + } \color{#FF6800}{ \beta } = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { - 7 } { 1 } } , \color{#FF6800}{ \alpha } \color{#FF6800}{ \beta } = \color{#FF6800}{ \dfrac { - 120 } { 1 } }$

$\alpha + \beta = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { - 7 } { 1 } } , \alpha \beta = \dfrac { - 120 } { 1 }$

$ $ Solve the sign of a fraction with a negative sign $ $

$\alpha + \beta = \color{#FF6800}{ \dfrac { 7 } { 1 } } , \alpha \beta = \dfrac { - 120 } { 1 }$

$\alpha + \beta = \dfrac { 7 } { \color{#FF6800}{ 1 } } , \alpha \beta = \dfrac { - 120 } { 1 }$

$ $ If the denominator is 1, the denominator can be removed $ $

$\alpha + \beta = \color{#FF6800}{ 7 } , \alpha \beta = \dfrac { - 120 } { 1 }$

$\alpha + \beta = 7 , \alpha \beta = \dfrac { - 120 } { \color{#FF6800}{ 1 } }$

$ $ If the denominator is 1, the denominator can be removed $ $

$\alpha + \beta = 7 , \alpha \beta = \color{#FF6800}{ - } \color{#FF6800}{ 120 }$