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Simplifying 8x2 + 24x = -4x2 + 15 Reorder the terms: 24x + 8x2 = -4x2 + 15 Reorder the terms: 24x + 8x2 = 15 + -4x2 Solving 24x + 8x2 = 15 + -4x2 Solving for variable 'x'. Reorder the terms: -15 + 24x + 8x2 + 4x2 = 15 + -4x2 + -15 + 4x2 Combine like terms: 8x2 + 4x2 = 12x2 -15 + 24x + 12x2 = 15 + -4x2 + -15 + 4x2 Reorder the terms: -15 + 24x + 12x2 = 15 + -15 + -4x2 + 4x2 Combine like terms: 15 + -15 = 0 -15 + 24x + 12x2 = 0 + -4x2 + 4x2 -15 + 24x + 12x2 = -4x2 + 4x2 Combine like terms: -4x2 + 4x2 = 0 -15 + 24x + 12x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-5 + 8x + 4x2) = 0 Factor a trinomial. 3((-5 + -2x)(1 + -2x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-5 + -2x)' equal to zero and attempt to solve: Simplifying -5 + -2x = 0 Solving -5 + -2x = 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 + -2x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2x = 0 + 5 -2x = 0 + 5 Combine like terms: 0 + 5 = 5 -2x = 5 Divide each side by '-2'. x = -2.5 Simplifying x = -2.5Subproblem 2
Set the factor '(1 + -2x)' equal to zero and attempt to solve: Simplifying 1 + -2x = 0 Solving 1 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2x = 0 + -1 -2x = 0 + -1 Combine like terms: 0 + -1 = -1 -2x = -1 Divide each side by '-2'. x = 0.5 Simplifying x = 0.5Solution
x = {-2.5, 0.5}
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