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Simplifying
(4x2 + -8x2 + 4) = 0
Reorder the terms:
(4 + 4x2 + -8x2) = 0
Combine like terms: 4x2 + -8x2 = -4x2
(4 + -4x2) = 0
Remove parenthesis around (4 + -4x2)
4 + -4x2 = 0
Solving
4 + -4x2 = 0
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 = 0 + -4
Combine like terms: 4 + -4 = 0
0 + -4x2 = 0 + -4
-4x2 = 0 + -4
Combine like terms: 0 + -4 = -4
-4x2 = -4
Divide each side by '-4'.
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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