# Calculator search results

Formula
Find the maximum and minimum of the quadratic function
$$y = x ^ { 2 } + 2 x - 3$$
$- 4$
$\color{#FF6800}{ y } = \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ + } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 }$
 Rewrite it as the standard form of the quadratic function 
$\color{#FF6800}{ y } = \left ( \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 4 }$
$\color{#FF6800}{ y } = \left ( \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 4 }$
 As $a \gt 0$ is, the minimum value is $- 4$ if $x = - 1$
$\color{#FF6800}{ - } \color{#FF6800}{ 4 }$