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Simplifying (2x + 4)(2x + 5) = 90 Reorder the terms: (4 + 2x)(2x + 5) = 90 Reorder the terms: (4 + 2x)(5 + 2x) = 90 Multiply (4 + 2x) * (5 + 2x) (4(5 + 2x) + 2x * (5 + 2x)) = 90 ((5 * 4 + 2x * 4) + 2x * (5 + 2x)) = 90 ((20 + 8x) + 2x * (5 + 2x)) = 90 (20 + 8x + (5 * 2x + 2x * 2x)) = 90 (20 + 8x + (10x + 4x2)) = 90 Combine like terms: 8x + 10x = 18x (20 + 18x + 4x2) = 90 Solving 20 + 18x + 4x2 = 90 Solving for variable 'x'. Reorder the terms: 20 + -90 + 18x + 4x2 = 90 + -90 Combine like terms: 20 + -90 = -70 -70 + 18x + 4x2 = 90 + -90 Combine like terms: 90 + -90 = 0 -70 + 18x + 4x2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(-35 + 9x + 2x2) = 0 Factor a trinomial. 2((-7 + -1x)(5 + -2x)) = 0 Ignore the factor 2.Subproblem 1
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 = -7Subproblem 2
Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5Solution
x = {-7, 2.5}
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