x*x+4=20

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Solution for x*x+4=20 equation: 


Simplifying
x * x + 4 = 20

Multiply x * x
x2 + 4 = 20

Reorder the terms:
4 + x2 = 20

Solving
4 + x2 = 20

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + x2 = 20 + -4

Combine like terms: 4 + -4 = 0
0 + x2 = 20 + -4
x2 = 20 + -4

Combine like terms: 20 + -4 = 16
x2 = 16

Simplifying
x2 = 16

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

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