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Simplifying -5x2 + 90x = 225 Reorder the terms: 90x + -5x2 = 225 Solving 90x + -5x2 = 225 Solving for variable 'x'. Reorder the terms: -225 + 90x + -5x2 = 225 + -225 Combine like terms: 225 + -225 = 0 -225 + 90x + -5x2 = 0 Factor out the Greatest Common Factor (GCF), '5'. 5(-45 + 18x + -1x2) = 0 Factor a trinomial. 5((-15 + x)(3 + -1x)) = 0 Ignore the factor 5.Subproblem 1
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 = 15Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 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 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3Solution
x = {15, 3}
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