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Simplifying (2x + 7)(2x + 7) = 9 Reorder the terms: (7 + 2x)(2x + 7) = 9 Reorder the terms: (7 + 2x)(7 + 2x) = 9 Multiply (7 + 2x) * (7 + 2x) (7(7 + 2x) + 2x * (7 + 2x)) = 9 ((7 * 7 + 2x * 7) + 2x * (7 + 2x)) = 9 ((49 + 14x) + 2x * (7 + 2x)) = 9 (49 + 14x + (7 * 2x + 2x * 2x)) = 9 (49 + 14x + (14x + 4x2)) = 9 Combine like terms: 14x + 14x = 28x (49 + 28x + 4x2) = 9 Solving 49 + 28x + 4x2 = 9 Solving for variable 'x'. Reorder the terms: 49 + -9 + 28x + 4x2 = 9 + -9 Combine like terms: 49 + -9 = 40 40 + 28x + 4x2 = 9 + -9 Combine like terms: 9 + -9 = 0 40 + 28x + 4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(10 + 7x + x2) = 0 Factor a trinomial. 4((5 + x)(2 + x)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 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 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5Subproblem 2
Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2Solution
x = {-5, -2}
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