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Simplifying
4x2 + -4 = 320
Reorder the terms:
-4 + 4x2 = 320
Solving
-4 + 4x2 = 320
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '4' to each side of the equation.
-4 + 4 + 4x2 = 320 + 4
Combine like terms: -4 + 4 = 0
0 + 4x2 = 320 + 4
4x2 = 320 + 4
Combine like terms: 320 + 4 = 324
4x2 = 324
Divide each side by '4'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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