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Simplifying 81(x + 7)(x + 3) = 0 Reorder the terms: 81(7 + x)(x + 3) = 0 Reorder the terms: 81(7 + x)(3 + x) = 0 Multiply (7 + x) * (3 + x) 81(7(3 + x) + x(3 + x)) = 0 81((3 * 7 + x * 7) + x(3 + x)) = 0 81((21 + 7x) + x(3 + x)) = 0 81(21 + 7x + (3 * x + x * x)) = 0 81(21 + 7x + (3x + x2)) = 0 Combine like terms: 7x + 3x = 10x 81(21 + 10x + x2) = 0 (21 * 81 + 10x * 81 + x2 * 81) = 0 (1701 + 810x + 81x2) = 0 Solving 1701 + 810x + 81x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '81'. 81(21 + 10x + x2) = 0 Factor a trinomial. 81((7 + x)(3 + x)) = 0 Ignore the factor 81.Subproblem 1
Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 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 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7Subproblem 2
Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3Solution
x = {-7, -3}
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