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Simplifying 2(x + -7)(x + 78) = 0 Reorder the terms: 2(-7 + x)(x + 78) = 0 Reorder the terms: 2(-7 + x)(78 + x) = 0 Multiply (-7 + x) * (78 + x) 2(-7(78 + x) + x(78 + x)) = 0 2((78 * -7 + x * -7) + x(78 + x)) = 0 2((-546 + -7x) + x(78 + x)) = 0 2(-546 + -7x + (78 * x + x * x)) = 0 2(-546 + -7x + (78x + x2)) = 0 Combine like terms: -7x + 78x = 71x 2(-546 + 71x + x2) = 0 (-546 * 2 + 71x * 2 + x2 * 2) = 0 (-1092 + 142x + 2x2) = 0 Solving -1092 + 142x + 2x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '2'. 2(-546 + 71x + x2) = 0 Factor a trinomial. 2((-78 + -1x)(7 + -1x)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-78 + -1x)' equal to zero and attempt to solve: Simplifying -78 + -1x = 0 Solving -78 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '78' to each side of the equation. -78 + 78 + -1x = 0 + 78 Combine like terms: -78 + 78 = 0 0 + -1x = 0 + 78 -1x = 0 + 78 Combine like terms: 0 + 78 = 78 -1x = 78 Divide each side by '-1'. x = -78 Simplifying x = -78Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7Solution
x = {-78, 7}
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