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Simplifying
x2 + 20 + -90 = 0
Reorder the terms:
20 + -90 + x2 = 0
Combine like terms: 20 + -90 = -70
-70 + x2 = 0
Solving
-70 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '70' to each side of the equation.
-70 + 70 + x2 = 0 + 70
Combine like terms: -70 + 70 = 0
0 + x2 = 0 + 70
x2 = 0 + 70
Combine like terms: 0 + 70 = 70
x2 = 70
Simplifying
x2 = 70
Take the square root of each side:
x = {-8.366600265, 8.366600265}
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