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Simplifying 80x + -4x2 = 300 Solving 80x + -4x2 = 300 Solving for variable 'x'. Reorder the terms: -300 + 80x + -4x2 = 300 + -300 Combine like terms: 300 + -300 = 0 -300 + 80x + -4x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(-75 + 20x + -1x2) = 0 Factor a trinomial. 4((-15 + x)(5 + -1x)) = 0 Ignore the factor 4.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 '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5Solution
x = {15, 5}
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