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Formula
$$x ^ { 2 } + 1 = 0$$
 Do not have the solution 
$x = \dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 0 } \pm \sqrt{ 0 ^ { 2 } - 4 \times 1 \times 1 } } { 2 \times 1 }$
 0 has no sign 
$x = \dfrac { \color{#FF6800}{ 0 } \pm \sqrt{ 0 ^ { 2 } - 4 \times 1 \times 1 } } { 2 \times 1 }$
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 0 } ^ { \color{#FF6800}{ 2 } } - 4 \times 1 \times 1 } } { 2 \times 1 }$
 The power of 0 is 0 
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 0 } - 4 \times 1 \times 1 } } { 2 \times 1 }$
$x = \dfrac { 0 \pm \sqrt{ \color{#FF6800}{ 0 } - 4 \times 1 \times 1 } } { 2 \times 1 }$
 0 does not change when you add or subtract 
$x = \dfrac { 0 \pm \sqrt{ - 4 \times 1 \times 1 } } { 2 \times 1 }$
$x = \dfrac { 0 \pm \sqrt{ - 4 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } \color{#FF6800}{ \times } \color{#FF6800}{ 1 } } } { 2 \times 1 }$
 Multiplying any number by 1 does not change the value 
$x = \dfrac { 0 \pm \sqrt{ - 4 } } { 2 \times 1 }$
$x = \dfrac { 0 \pm \sqrt{ - 4 } } { 2 \color{#FF6800}{ \times } \color{#FF6800}{ 1 } }$
 Multiplying any number by 1 does not change the value 
$x = \dfrac { 0 \pm \sqrt{ - 4 } } { \color{#FF6800}{ 2 } }$
$\color{#FF6800}{ x } = \color{#FF6800}{ \dfrac { 0 \pm \sqrt{ - 4 } } { 2 } }$
 The square root of a negative number does not exist within the set of real numbers 
 Do not have the solution 
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