x*x-7=9

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Solution for x*x-7=9 equation: 


Simplifying
x * x + -7 = 9

Multiply x * x
x2 + -7 = 9

Reorder the terms:
-7 + x2 = 9

Solving
-7 + x2 = 9

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + x2 = 9 + 7

Combine like terms: -7 + 7 = 0
0 + x2 = 9 + 7
x2 = 9 + 7

Combine like terms: 9 + 7 = 16
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}

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