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Simplifying 21x2 + 135x = 84 Reorder the terms: 135x + 21x2 = 84 Solving 135x + 21x2 = 84 Solving for variable 'x'. Reorder the terms: -84 + 135x + 21x2 = 84 + -84 Combine like terms: 84 + -84 = 0 -84 + 135x + 21x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-28 + 45x + 7x2) = 0 Factor a trinomial. 3((-7 + -1x)(4 + -7x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-7 + -1x)' equal to zero and attempt to solve: Simplifying -7 + -1x = 0 Solving -7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7Subproblem 2
Set the factor '(4 + -7x)' equal to zero and attempt to solve: Simplifying 4 + -7x = 0 Solving 4 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -7x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7x = 0 + -4 -7x = 0 + -4 Combine like terms: 0 + -4 = -4 -7x = -4 Divide each side by '-7'. x = 0.5714285714 Simplifying x = 0.5714285714Solution
x = {-7, 0.5714285714}
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