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Formula
$$x ^ { 2 } + 4 x + 4 = 0$$
$x = - 2$
$x = \dfrac { - 4 \pm \sqrt{ \color{#FF6800}{ 4 } ^ { \color{#FF6800}{ 2 } } - 4 \times 1 \times 4 } } { 2 \times 1 }$
 Calculate power 
$x = \dfrac { - 4 \pm \sqrt{ \color{#FF6800}{ 16 } - 4 \times 1 \times 4 } } { 2 \times 1 }$
$x = \dfrac { - 4 \pm \sqrt{ 16 - 4 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } \times 4 } } { 2 \times 1 }$
 Multiplying any number by 1 does not change the value 
$x = \dfrac { - 4 \pm \sqrt{ 16 - 4 \times 4 } } { 2 \times 1 }$
$x = \dfrac { - 4 \pm \sqrt{ 16 \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } } } { 2 \times 1 }$
 Multiply $- 4$ and $4$
$x = \dfrac { - 4 \pm \sqrt{ 16 \color{#FF6800}{ - } \color{#FF6800}{ 16 } } } { 2 \times 1 }$
$x = \dfrac { - 4 \pm \sqrt{ \color{#FF6800}{ 16 } \color{#FF6800}{ - } \color{#FF6800}{ 16 } } } { 2 \times 1 }$
 Remove the two numbers if the values are the same and the signs are different 
$x = \dfrac { - 4 \pm \sqrt{ 0 } } { 2 \times 1 }$
$x = \dfrac { - 4 \pm \sqrt{ \color{#FF6800}{ 0 } } } { 2 \times 1 }$
$n square root$ of 0 is 0 
$x = \dfrac { - 4 \pm \color{#FF6800}{ 0 } } { 2 \times 1 }$
$x = \dfrac { - 4 \pm 0 } { 2 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } }$
 Multiplying any number by 1 does not change the value 
$x = \dfrac { - 4 \pm 0 } { \color{#FF6800}{ 2 } }$
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { - 4 \pm 0 } { 2 } }$
 The value will not be changed even if adding or subtracting 0 
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { - 4 } { 2 } }$
$x = \color{#FF6800}{ \dfrac { - 4 } { 2 } }$
 Do the reduction of the fraction format 
$x = \color{#FF6800}{ \dfrac { - 2 } { 1 } }$
$x = \dfrac { - 2 } { \color{#FF6800}{ 1 } }$
 If the denominator is 1, the denominator can be removed 
$x = \color{#FF6800}{ - } \color{#FF6800}{ 2 }$
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