20-x^2=4

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Solution for 20-x^2=4 equation: 


Simplifying
20 + -1x2 = 4

Solving
20 + -1x2 = 4

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -1x2 = 4 + -20

Combine like terms: 20 + -20 = 0
0 + -1x2 = 4 + -20
-1x2 = 4 + -20

Combine like terms: 4 + -20 = -16
-1x2 = -16

Divide each side by '-1'.
x2 = 16

Simplifying
x2 = 16

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

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