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Simplifying
2x2 + -90 = 80
Reorder the terms:
-90 + 2x2 = 80
Solving
-90 + 2x2 = 80
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '90' to each side of the equation.
-90 + 90 + 2x2 = 80 + 90
Combine like terms: -90 + 90 = 0
0 + 2x2 = 80 + 90
2x2 = 80 + 90
Combine like terms: 80 + 90 = 170
2x2 = 170
Divide each side by '2'.
x2 = 85
Simplifying
x2 = 85
Take the square root of each side:
x = {-9.219544457, 9.219544457}
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