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Simplifying
4(x2 + -4) = 84
Reorder the terms:
4(-4 + x2) = 84
(-4 * 4 + x2 * 4) = 84
(-16 + 4x2) = 84
Solving
-16 + 4x2 = 84
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '16' to each side of the equation.
-16 + 16 + 4x2 = 84 + 16
Combine like terms: -16 + 16 = 0
0 + 4x2 = 84 + 16
4x2 = 84 + 16
Combine like terms: 84 + 16 = 100
4x2 = 100
Divide each side by '4'.
x2 = 25
Simplifying
x2 = 25
Take the square root of each side:
x = {-5, 5}
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