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Simplifying (x2 + 3) + (x + 15) = 90 Reorder the terms: (3 + x2) + (x + 15) = 90 Remove parenthesis around (3 + x2) 3 + x2 + (x + 15) = 90 Reorder the terms: 3 + x2 + (15 + x) = 90 Remove parenthesis around (15 + x) 3 + x2 + 15 + x = 90 Reorder the terms: 3 + 15 + x + x2 = 90 Combine like terms: 3 + 15 = 18 18 + x + x2 = 90 Solving 18 + x + x2 = 90 Solving for variable 'x'. Reorder the terms: 18 + -90 + x + x2 = 90 + -90 Combine like terms: 18 + -90 = -72 -72 + x + x2 = 90 + -90 Combine like terms: 90 + -90 = 0 -72 + x + x2 = 0 Factor a trinomial. (-9 + -1x)(8 + -1x) = 0Subproblem 1
Set the factor '(-9 + -1x)' equal to zero and attempt to solve: Simplifying -9 + -1x = 0 Solving -9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9Subproblem 2
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 = 8Solution
x = {-9, 8}
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