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Simplifying 8x2 + 18x + -15 = 20 Reorder the terms: -15 + 18x + 8x2 = 20 Solving -15 + 18x + 8x2 = 20 Solving for variable 'x'. Reorder the terms: -15 + -20 + 18x + 8x2 = 20 + -20 Combine like terms: -15 + -20 = -35 -35 + 18x + 8x2 = 20 + -20 Combine like terms: 20 + -20 = 0 -35 + 18x + 8x2 = 0 Factor a trinomial. (-7 + -2x)(5 + -4x) = 0Subproblem 1
Set the factor '(-7 + -2x)' equal to zero and attempt to solve: Simplifying -7 + -2x = 0 Solving -7 + -2x = 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 + -2x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = 0 + 7 -2x = 0 + 7 Combine like terms: 0 + 7 = 7 -2x = 7 Divide each side by '-2'. x = -3.5 Simplifying x = -3.5Subproblem 2
Set the factor '(5 + -4x)' equal to zero and attempt to solve: Simplifying 5 + -4x = 0 Solving 5 + -4x = 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 + -4x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4x = 0 + -5 -4x = 0 + -5 Combine like terms: 0 + -5 = -5 -4x = -5 Divide each side by '-4'. x = 1.25 Simplifying x = 1.25Solution
x = {-3.5, 1.25}
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