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Simplifying 102 = (x + 9)(x + -2) Reorder the terms: 102 = (9 + x)(x + -2) Reorder the terms: 102 = (9 + x)(-2 + x) Multiply (9 + x) * (-2 + x) 102 = (9(-2 + x) + x(-2 + x)) 102 = ((-2 * 9 + x * 9) + x(-2 + x)) 102 = ((-18 + 9x) + x(-2 + x)) 102 = (-18 + 9x + (-2 * x + x * x)) 102 = (-18 + 9x + (-2x + x2)) Combine like terms: 9x + -2x = 7x 102 = (-18 + 7x + x2) Solving 102 = -18 + 7x + x2 Solving for variable 'x'. Combine like terms: 102 + 18 = 120 120 + -7x + -1x2 = -18 + 7x + x2 + 18 + -7x + -1x2 Reorder the terms: 120 + -7x + -1x2 = -18 + 18 + 7x + -7x + x2 + -1x2 Combine like terms: -18 + 18 = 0 120 + -7x + -1x2 = 0 + 7x + -7x + x2 + -1x2 120 + -7x + -1x2 = 7x + -7x + x2 + -1x2 Combine like terms: 7x + -7x = 0 120 + -7x + -1x2 = 0 + x2 + -1x2 120 + -7x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 120 + -7x + -1x2 = 0 Factor a trinomial. (8 + -1x)(15 + x) = 0Subproblem 1
Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8Subproblem 2
Set the factor '(15 + x)' equal to zero and attempt to solve: Simplifying 15 + x = 0 Solving 15 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + x = 0 + -15 x = 0 + -15 Combine like terms: 0 + -15 = -15 x = -15 Simplifying x = -15Solution
x = {8, -15}
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