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Simplifying
2(x2 + 2) = 18
Reorder the terms:
2(2 + x2) = 18
(2 * 2 + x2 * 2) = 18
(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 = 14
2x2 = 14
Divide each side by '2'.
x2 = 7
Simplifying
x2 = 7
Take the square root of each side:
x = {-2.645751311, 2.645751311}
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