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Simplifying
2x2 = -4x2 + 216
Reorder the terms:
2x2 = 216 + -4x2
Solving
2x2 = 216 + -4x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '4x2' to each side of the equation.
2x2 + 4x2 = 216 + -4x2 + 4x2
Combine like terms: 2x2 + 4x2 = 6x2
6x2 = 216 + -4x2 + 4x2
Combine like terms: -4x2 + 4x2 = 0
6x2 = 216 + 0
6x2 = 216
Divide each side by '6'.
x2 = 36
Simplifying
x2 = 36
Take the square root of each side:
x = {-6, 6}
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