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Solve an expression involving the absolute value

Answer

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$y = x ^ { 2 } - | x | - 20$

$y = 0$

$x ^{ 2 } - | x | -20 = 0$

$\begin{array} {l} x = - 5 \\ x = 5 \end{array}$

$ $ Solve a solution to $ x$

$x ^ { 2 } - | x | \color{#FF6800}{ - } \color{#FF6800}{ 20 } = 0$

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

$x ^ { 2 } - | x | = \color{#FF6800}{ 20 }$

$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } | \color{#FF6800}{ x } | = \color{#FF6800}{ 20 }$

$ $ Divide the interval based on the value where the inside of the absolute value is 0 $ $

$\color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } \color{#FF6800}{ x } \right ) = \color{#FF6800}{ 20 } \left ( \text{However (or only)} \color{#FF6800}{ x } < \color{#FF6800}{ 0 } \right ) \\ \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ x } = \color{#FF6800}{ 20 } \left ( \text{However (or only)} \color{#FF6800}{ x } \geq \color{#FF6800}{ 0 } \right )$

$ $ Find the solution $ $

$\left. \begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 5 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ 4 } \end{array} \right\} \left ( \text{However (or only)} \color{#FF6800}{ x } < \color{#FF6800}{ 0 } \right ) \\ \left. \begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 4 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ 5 } \end{array} \right\} \left ( $ However (or only) $ \color{#FF6800}{ x } \geq \color{#FF6800}{ 0 } \right )$

$ $ Make sure if the value is within the interval $ $

$\color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 5 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ 5 }$

$ $ Find the union of sets of each interval $ $

$\begin{array} {l} \color{#FF6800}{ x } = \color{#FF6800}{ - } \color{#FF6800}{ 5 } \\ \color{#FF6800}{ x } = \color{#FF6800}{ 5 } \end{array}$

$ $ 그래프 보기 $ $

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