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Simplifying 4x2 + -104 = 5x2 + 21x Reorder the terms: -104 + 4x2 = 5x2 + 21x Reorder the terms: -104 + 4x2 = 21x + 5x2 Solving -104 + 4x2 = 21x + 5x2 Solving for variable 'x'. Reorder the terms: -104 + -21x + 4x2 + -5x2 = 21x + 5x2 + -21x + -5x2 Combine like terms: 4x2 + -5x2 = -1x2 -104 + -21x + -1x2 = 21x + 5x2 + -21x + -5x2 Reorder the terms: -104 + -21x + -1x2 = 21x + -21x + 5x2 + -5x2 Combine like terms: 21x + -21x = 0 -104 + -21x + -1x2 = 0 + 5x2 + -5x2 -104 + -21x + -1x2 = 5x2 + -5x2 Combine like terms: 5x2 + -5x2 = 0 -104 + -21x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(104 + 21x + x2) = 0 Factor a trinomial. -1((13 + x)(8 + x)) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(13 + x)' equal to zero and attempt to solve: Simplifying 13 + x = 0 Solving 13 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + x = 0 + -13 x = 0 + -13 Combine like terms: 0 + -13 = -13 x = -13 Simplifying x = -13Subproblem 2
Set the factor '(8 + x)' equal to zero and attempt to solve: Simplifying 8 + x = 0 Solving 8 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + x = 0 + -8 x = 0 + -8 Combine like terms: 0 + -8 = -8 x = -8 Simplifying x = -8Solution
x = {-13, -8}
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