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Simplifying
9 + 9 = x2
Combine like terms: 9 + 9 = 18
18 = x2
Solving
18 = 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.
18 + -1x2 = x2 + -1x2
Combine like terms: x2 + -1x2 = 0
18 + -1x2 = 0
Add '-18' to each side of the equation.
18 + -18 + -1x2 = 0 + -18
Combine like terms: 18 + -18 = 0
0 + -1x2 = 0 + -18
-1x2 = 0 + -18
Combine like terms: 0 + -18 = -18
-1x2 = -18
Divide each side by '-1'.
x2 = 18
Simplifying
x2 = 18
Take the square root of each side:
x = {-4.242640687, 4.242640687}
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