Symbol

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Formula
Number of solution
Relationship between roots and coefficients
Graph
$y = 15 x ^ { 2 }$
$y = 9$
$x$Intercept
$\left ( 0 , 0 \right )$
$y$Intercept
$\left ( 0 , 0 \right )$
Minimum
$\left ( 0 , 0 \right )$
Standard form
$y = 15 x ^ { 2 }$
$15x ^{ 2 } = 9$
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = - \dfrac { \sqrt{ 15 } } { 5 } \end{array}$
Solve quadratic equations using the square root
$15 x ^ { 2 } = \color{#FF6800}{ 9 }$
 Move the expression to the left side and change the symbol 
$15 x ^ { 2 } - 9 = 0$
$\color{#FF6800}{ 15 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 9 } = \color{#FF6800}{ 0 }$
 Divide both sides by the coefficient of the leading highest term 
$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 3 } { 5 } } = \color{#FF6800}{ 0 }$
$x ^ { 2 } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 3 } { 5 } } = 0$
 Move the constant to the right side and change the sign 
$x ^ { 2 } = \color{#FF6800}{ \dfrac { 3 } { 5 } }$
$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } = \color{#FF6800}{ \dfrac { 3 } { 5 } }$
 Solve quadratic equations using the square root 
$\color{#FF6800}{ x } = \pm \sqrt{ \color{#FF6800}{ \dfrac { 3 } { 5 } } }$
$\color{#FF6800}{ x } = \pm \sqrt{ \color{#FF6800}{ \dfrac { 3 } { 5 } } }$
 Solve a solution to $x$
$\color{#FF6800}{ x } = \pm \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } }$
$\color{#FF6800}{ x } = \pm \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } }$
 Separate the answer 
$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } } \\ \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } } \end{array}$
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = - \dfrac { \sqrt{ 15 } } { 5 } \end{array}$
$15 x ^ { 2 } = \color{#FF6800}{ 9 }$
 Move the expression to the left side and change the symbol 
$15 x ^ { 2 } - 9 = 0$
$\color{#FF6800}{ 15 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 9 } = 0$
 Bind the expressions with the common factor $3$
$\color{#FF6800}{ 3 } \left ( \color{#FF6800}{ 5 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) = 0$
$\color{#FF6800}{ 3 } \left ( \color{#FF6800}{ 5 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) = \color{#FF6800}{ 0 }$
 Divide both sides by $3$
$\color{#FF6800}{ 5 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 3 } = \color{#FF6800}{ 0 }$
$x = \dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 0 } \pm \sqrt{ 0 ^ { 2 } - 4 \times 5 \times \left ( - 3 \right ) } } { 2 \times 5 }$
 0 has no sign 
$x = \dfrac { \color{#FF6800}{ 0 } \pm \sqrt{ 0 ^ { 2 } - 4 \times 5 \times \left ( - 3 \right ) } } { 2 \times 5 }$
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 0 } ^ { \color{#FF6800}{ 2 } } - 4 \times 5 \times \left ( - 3 \right ) } } { 2 \times 5 }$
 The power of 0 is 0 
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 0 } - 4 \times 5 \times \left ( - 3 \right ) } } { 2 \times 5 }$
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 \pm \sqrt{ 0 - 4 \times 5 \times \left ( - 3 \right ) } } { 2 \times 5 } }$
 Organize the expression 
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 \pm \sqrt{ 60 } } { 2 \times 5 } }$
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 60 } } } { 2 \times 5 }$
 Organize the part that can be taken out of the radical sign inside the square root symbol 
$x = \dfrac { 0 \pm \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 15 } } } { 2 \times 5 }$
$x = \dfrac { 0 \pm 2 \sqrt{ 15 } } { \color{#FF6800}{ 2 } \color{#FF6800}{ \times } \color{#FF6800}{ 5 } }$
 Multiply $2$ and $5$
$x = \dfrac { 0 \pm 2 \sqrt{ 15 } } { \color{#FF6800}{ 10 } }$
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 \pm 2 \sqrt{ 15 } } { 10 } }$
 Separate the answer 
$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 + 2 \sqrt{ 15 } } { 10 } } \\ \color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 - 2 \sqrt{ 15 } } { 10 } } \end{array}$
$\begin{array} {l} x = \dfrac { \color{#FF6800}{ 0 } + 2 \sqrt{ 15 } } { 10 } \\ x = \dfrac { 0 - 2 \sqrt{ 15 } } { 10 } \end{array}$
 0 does not change when you add or subtract 
$\begin{array} {l} x = \dfrac { 2 \sqrt{ 15 } } { 10 } \\ x = \dfrac { 0 - 2 \sqrt{ 15 } } { 10 } \end{array}$
$\begin{array} {l} x = \color{#FF6800}{ \dfrac { 2 \sqrt{ 15 } } { 10 } } \\ x = \dfrac { 0 - 2 \sqrt{ 15 } } { 10 } \end{array}$
 Do the reduction of the fraction format 
$\begin{array} {l} x = \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } } \\ x = \dfrac { 0 - 2 \sqrt{ 15 } } { 10 } \end{array}$
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \dfrac { \color{#FF6800}{ 0 } - 2 \sqrt{ 15 } } { 10 } \end{array}$
 0 does not change when you add or subtract 
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \dfrac { - 2 \sqrt{ 15 } } { 10 } \end{array}$
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \color{#FF6800}{ \dfrac { - 2 \sqrt{ 15 } } { 10 } } \end{array}$
 Do the reduction of the fraction format 
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \color{#FF6800}{ \dfrac { - \sqrt{ 15 } } { 5 } } \end{array}$
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \dfrac { \color{#FF6800}{ - } \sqrt{ \color{#FF6800}{ 15 } } } { 5 } \end{array}$
 Move the minus sign to the front of the fraction 
$\begin{array} {l} x = \dfrac { \sqrt{ 15 } } { 5 } \\ x = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { \sqrt{ 15 } } { 5 } } \end{array}$
 2 real roots 
Find the number of solutions
$15 x ^ { 2 } = \color{#FF6800}{ 9 }$
 Move the expression to the left side and change the symbol 
$15 x ^ { 2 } - 9 = 0$
$\color{#FF6800}{ 15 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 9 } = \color{#FF6800}{ 0 }$
 Determine the number of roots using discriminant, $D=b^{2}-4ac$ from quadratic equation, $ax^{2}+bx+c=0$
$\color{#FF6800}{ D } = \color{#FF6800}{ 0 } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 15 } \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right )$
$D = \color{#FF6800}{ 0 } ^ { \color{#FF6800}{ 2 } } - 4 \times 15 \times \left ( - 9 \right )$
 The power of 0 is 0 
$D = \color{#FF6800}{ 0 } - 4 \times 15 \times \left ( - 9 \right )$
$D = \color{#FF6800}{ 0 } - 4 \times 15 \times \left ( - 9 \right )$
 0 does not change when you add or subtract 
$D = - 4 \times 15 \times \left ( - 9 \right )$
$D = \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 15 } \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right )$
 Multiply the numbers 
$D = \color{#FF6800}{ 540 }$
$\color{#FF6800}{ D } = \color{#FF6800}{ 540 }$
 Since $D>0$ , the number of real root of the following quadratic equation is 2 
 2 real roots 
$\alpha + \beta = 0 , \alpha \beta = - \dfrac { 3 } { 5 }$
Find the sum and product of the two roots of the quadratic equation
$15 x ^ { 2 } = \color{#FF6800}{ 9 }$
 Move the expression to the left side and change the symbol 
$15 x ^ { 2 } - 9 = 0$
$\color{#FF6800}{ 15 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 9 } = \color{#FF6800}{ 0 }$
 In the quadratic equation $ax^{2}+bx+c=0$ , if the two roots are $\alpha, \beta$ , then it is $\alpha + \beta =-\dfrac{b}{a}$ , $\alpha\times\beta=\dfrac{c}{a}$
$\color{#FF6800}{ \alpha } \color{#FF6800}{ + } \color{#FF6800}{ \beta } = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 0 } { 15 } } , \color{#FF6800}{ \alpha } \color{#FF6800}{ \beta } = \color{#FF6800}{ \dfrac { - 9 } { 15 } }$
$\alpha + \beta = - \color{#FF6800}{ \dfrac { 0 } { 15 } } , \alpha \beta = \dfrac { - 9 } { 15 }$
 If the numerator is 0, it is equal to 0 
$\alpha + \beta = - \color{#FF6800}{ 0 } , \alpha \beta = \dfrac { - 9 } { 15 }$
$\alpha + \beta = \color{#FF6800}{ - } \color{#FF6800}{ 0 } , \alpha \beta = \dfrac { - 9 } { 15 }$
 0 has no sign 
$\alpha + \beta = \color{#FF6800}{ 0 } , \alpha \beta = \dfrac { - 9 } { 15 }$
$\alpha + \beta = 0 , \alpha \beta = \color{#FF6800}{ \dfrac { - 9 } { 15 } }$
 Reduce the fraction 
$\alpha + \beta = 0 , \alpha \beta = \color{#FF6800}{ \dfrac { - 3 } { 5 } }$
$\alpha + \beta = 0 , \alpha \beta = \dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 3 } } { 5 }$
 Move the minus sign to the front of the fraction 
$\alpha + \beta = 0 , \alpha \beta = \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 3 } { 5 } }$
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