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Simplifying
x2 + 12 + -30 = 0
Reorder the terms:
12 + -30 + x2 = 0
Combine like terms: 12 + -30 = -18
-18 + x2 = 0
Solving
-18 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + x2 = 0 + 18
Combine like terms: -18 + 18 = 0
0 + x2 = 0 + 18
x2 = 0 + 18
Combine like terms: 0 + 18 = 18
x2 = 18
Simplifying
x2 = 18
Take the square root of each side:
x = {-4.242640687, 4.242640687}
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