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Simplifying
4x2 + -28 = 8
Reorder the terms:
-28 + 4x2 = 8
Solving
-28 + 4x2 = 8
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '28' to each side of the equation.
-28 + 28 + 4x2 = 8 + 28
Combine like terms: -28 + 28 = 0
0 + 4x2 = 8 + 28
4x2 = 8 + 28
Combine like terms: 8 + 28 = 36
4x2 = 36
Divide each side by '4'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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