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Simplifying
90 = x2 + 9
Reorder the terms:
90 = 9 + x2
Solving
90 = 9 + x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1x2' to each side of the equation.
90 + -1x2 = 9 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
90 + -1x2 = 9 + 0
90 + -1x2 = 9
Add '-90' to each side of the equation.
90 + -90 + -1x2 = 9 + -90
Combine like terms: 90 + -90 = 0
0 + -1x2 = 9 + -90
-1x2 = 9 + -90
Combine like terms: 9 + -90 = -81
-1x2 = -81
Divide each side by '-1'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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