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Simplifying 4x2 + -54 = 5x2 + 21x Reorder the terms: -54 + 4x2 = 5x2 + 21x Reorder the terms: -54 + 4x2 = 21x + 5x2 Solving -54 + 4x2 = 21x + 5x2 Solving for variable 'x'. Reorder the terms: -54 + -21x + 4x2 + -5x2 = 21x + 5x2 + -21x + -5x2 Combine like terms: 4x2 + -5x2 = -1x2 -54 + -21x + -1x2 = 21x + 5x2 + -21x + -5x2 Reorder the terms: -54 + -21x + -1x2 = 21x + -21x + 5x2 + -5x2 Combine like terms: 21x + -21x = 0 -54 + -21x + -1x2 = 0 + 5x2 + -5x2 -54 + -21x + -1x2 = 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 -54 + -21x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(54 + 21x + x2) = 0 Factor a trinomial. -1((18 + x)(3 + x)) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(18 + x)' equal to zero and attempt to solve: Simplifying 18 + x = 0 Solving 18 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = 0 + -18 Combine like terms: 18 + -18 = 0 0 + x = 0 + -18 x = 0 + -18 Combine like terms: 0 + -18 = -18 x = -18 Simplifying x = -18Subproblem 2
Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3Solution
x = {-18, -3}
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