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Simplifying
-2x2 + -4 = -20
Reorder the terms:
-4 + -2x2 = -20
Solving
-4 + -2x2 = -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 + -2x2 = -20 + 4
Combine like terms: -4 + 4 = 0
0 + -2x2 = -20 + 4
-2x2 = -20 + 4
Combine like terms: -20 + 4 = -16
-2x2 = -16
Divide each side by '-2'.
x2 = 8
Simplifying
x2 = 8
Take the square root of each side:
x = {-2.828427125, 2.828427125}
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