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Simplifying
-720 = x(-9x)
Remove parenthesis around (-9x)
-720 = x * -9x
Reorder the terms for easier multiplication:
-720 = -9x * x
Multiply x * x
-720 = -9x2
Solving
-720 = -9x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '9x2' to each side of the equation.
-720 + 9x2 = -9x2 + 9x2
Combine like terms: -9x2 + 9x2 = 0
-720 + 9x2 = 0
Add '720' to each side of the equation.
-720 + 720 + 9x2 = 0 + 720
Combine like terms: -720 + 720 = 0
0 + 9x2 = 0 + 720
9x2 = 0 + 720
Combine like terms: 0 + 720 = 720
9x2 = 720
Divide each side by '9'.
x2 = 80
Simplifying
x2 = 80
Take the square root of each side:
x = {-8.94427191, 8.94427191}
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