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Simplifying
3[x2 + 2] = 18
Reorder the terms:
3[2 + x2] = 18
[2 * 3 + x2 * 3] = 18
[6 + 3x2] = 18
Solving
6 + 3x2 = 18
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-6' to each side of the equation.
6 + -6 + 3x2 = 18 + -6
Combine like terms: 6 + -6 = 0
0 + 3x2 = 18 + -6
3x2 = 18 + -6
Combine like terms: 18 + -6 = 12
3x2 = 12
Divide each side by '3'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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