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Simplifying
3 = 2x2 + -18
Reorder the terms:
3 = -18 + 2x2
Solving
3 = -18 + 2x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-2x2' to each side of the equation.
3 + -2x2 = -18 + 2x2 + -2x2
Combine like terms: 2x2 + -2x2 = 0
3 + -2x2 = -18 + 0
3 + -2x2 = -18
Add '-3' to each side of the equation.
3 + -3 + -2x2 = -18 + -3
Combine like terms: 3 + -3 = 0
0 + -2x2 = -18 + -3
-2x2 = -18 + -3
Combine like terms: -18 + -3 = -21
-2x2 = -21
Divide each side by '-2'.
x2 = 10.5
Simplifying
x2 = 10.5
Take the square root of each side:
x = {-3.240370349, 3.240370349}
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