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Simplifying
4(x2 + 5) = 56
Reorder the terms:
4(5 + x2) = 56
(5 * 4 + x2 * 4) = 56
(20 + 4x2) = 56
Solving
20 + 4x2 = 56
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-20' to each side of the equation.
20 + -20 + 4x2 = 56 + -20
Combine like terms: 20 + -20 = 0
0 + 4x2 = 56 + -20
4x2 = 56 + -20
Combine like terms: 56 + -20 = 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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