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Simplifying
80x2 + -720 = 0
Reorder the terms:
-720 + 80x2 = 0
Solving
-720 + 80x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '720' to each side of the equation.
-720 + 720 + 80x2 = 0 + 720
Combine like terms: -720 + 720 = 0
0 + 80x2 = 0 + 720
80x2 = 0 + 720
Combine like terms: 0 + 720 = 720
80x2 = 720
Divide each side by '80'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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