$x = \dfrac { \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } 28 \right ) \pm \sqrt{ \left ( - 28 \right ) ^ { 2 } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$ $ Simplify Minus $ $
$x = \dfrac { 28 \pm \sqrt{ \left ( - 28 \right ) ^ { 2 } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$x = \dfrac { 28 \pm \sqrt{ \left ( \color{#FF6800}{ - } \color{#FF6800}{ 28 } \right ) ^ { \color{#FF6800}{ 2 } } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$ $ Remove negative signs because negative numbers raised to even powers are positive $ $
$x = \dfrac { 28 \pm \sqrt{ 28 ^ { 2 } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$x = \dfrac { 28 \pm \sqrt{ \color{#FF6800}{ 28 } ^ { \color{#FF6800}{ 2 } } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$ $ Calculate power $ $
$x = \dfrac { 28 \pm \sqrt{ \color{#FF6800}{ 784 } - 4 \times 4 \times 49 } } { 2 \times 4 }$
$x = \dfrac { 28 \pm \sqrt{ 784 \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 49 } } } { 2 \times 4 }$
$ $ Multiply the numbers $ $
$x = \dfrac { 28 \pm \sqrt{ 784 \color{#FF6800}{ - } \color{#FF6800}{ 784 } } } { 2 \times 4 }$
$x = \dfrac { 28 \pm \sqrt{ \color{#FF6800}{ 784 } \color{#FF6800}{ - } \color{#FF6800}{ 784 } } } { 2 \times 4 }$
$ $ Remove the two numbers if the values are the same and the signs are different $ $
$x = \dfrac { 28 \pm \sqrt{ 0 } } { 2 \times 4 }$
$x = \dfrac { 28 \pm \sqrt{ \color{#FF6800}{ 0 } } } { 2 \times 4 }$
$n square root $ of 0 is 0 $ $
$x = \dfrac { 28 \pm \color{#FF6800}{ 0 } } { 2 \times 4 }$
$x = \dfrac { 28 \pm 0 } { \color{#FF6800}{ 2 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } }$
$ $ Multiply $ 2 $ and $ 4$
$x = \dfrac { 28 \pm 0 } { \color{#FF6800}{ 8 } }$
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 28 \pm 0 } { 8 } }$
$ $ The value will not be changed even if adding or subtracting 0 $ $
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 28 } { 8 } }$
$x = \color{#FF6800}{ \dfrac { 28 } { 8 } }$
$ $ Do the reduction of the fraction format $ $
$x = \color{#FF6800}{ \dfrac { 7 } { 2 } }$