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Simplifying 21x2 = 15 + 102x Solving 21x2 = 15 + 102x Solving for variable 'x'. Reorder the terms: -15 + -102x + 21x2 = 15 + 102x + -15 + -102x Reorder the terms: -15 + -102x + 21x2 = 15 + -15 + 102x + -102x Combine like terms: 15 + -15 = 0 -15 + -102x + 21x2 = 0 + 102x + -102x -15 + -102x + 21x2 = 102x + -102x Combine like terms: 102x + -102x = 0 -15 + -102x + 21x2 = 0 Factor out the Greatest Common Factor (GCF), '3'. 3(-5 + -34x + 7x2) = 0 Factor a trinomial. 3((-1 + -7x)(5 + -1x)) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-1 + -7x)' equal to zero and attempt to solve: Simplifying -1 + -7x = 0 Solving -1 + -7x = 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 + -7x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -7x = 0 + 1 -7x = 0 + 1 Combine like terms: 0 + 1 = 1 -7x = 1 Divide each side by '-7'. x = -0.1428571429 Simplifying x = -0.1428571429Subproblem 2
Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5Solution
x = {-0.1428571429, 5}
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