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Simplifying
2x2 + -4 = 18
Reorder the terms:
-4 + 2x2 = 18
Solving
-4 + 2x2 = 18
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 = 18 + 4
Combine like terms: -4 + 4 = 0
0 + 2x2 = 18 + 4
2x2 = 18 + 4
Combine like terms: 18 + 4 = 22
2x2 = 22
Divide each side by '2'.
x2 = 11
Simplifying
x2 = 11
Take the square root of each side:
x = {-3.31662479, 3.31662479}
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