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Simplifying 20(6) = 4x(2x + -7) Multiply 20 * 6 120 = 4x(2x + -7) Reorder the terms: 120 = 4x(-7 + 2x) 120 = (-7 * 4x + 2x * 4x) 120 = (-28x + 8x2) Solving 120 = -28x + 8x2 Solving for variable 'x'. Reorder the terms: 120 + 28x + -8x2 = -28x + 28x + 8x2 + -8x2 Combine like terms: -28x + 28x = 0 120 + 28x + -8x2 = 0 + 8x2 + -8x2 120 + 28x + -8x2 = 8x2 + -8x2 Combine like terms: 8x2 + -8x2 = 0 120 + 28x + -8x2 = 0 Factor out the Greatest Common Factor (GCF), '4'. 4(30 + 7x + -2x2) = 0 Factor a trinomial. 4((6 + -1x)(5 + 2x)) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(6 + -1x)' equal to zero and attempt to solve: Simplifying 6 + -1x = 0 Solving 6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1x = 0 + -6 -1x = 0 + -6 Combine like terms: 0 + -6 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6Subproblem 2
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 = -2.5Solution
x = {6, -2.5}
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