16-4x^2=-20

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Solution for 16-4x^2=-20 equation: 


Simplifying
16 + -4x2 = -20

Solving
16 + -4x2 = -20

Solving for variable 'x'.

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

Add '-16' to each side of the equation.
16 + -16 + -4x2 = -20 + -16

Combine like terms: 16 + -16 = 0
0 + -4x2 = -20 + -16
-4x2 = -20 + -16

Combine like terms: -20 + -16 = -36
-4x2 = -36

Divide each side by '-4'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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