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Simplifying 7x2 = -21x + 280 Reorder the terms: 7x2 = 280 + -21x Solving 7x2 = 280 + -21x Solving for variable 'x'. Reorder the terms: -280 + 21x + 7x2 = 280 + -21x + -280 + 21x Reorder the terms: -280 + 21x + 7x2 = 280 + -280 + -21x + 21x Combine like terms: 280 + -280 = 0 -280 + 21x + 7x2 = 0 + -21x + 21x -280 + 21x + 7x2 = -21x + 21x Combine like terms: -21x + 21x = 0 -280 + 21x + 7x2 = 0 Factor out the Greatest Common Factor (GCF), '7'. 7(-40 + 3x + x2) = 0 Factor a trinomial. 7((-8 + -1x)(5 + -1x)) = 0 Ignore the factor 7.Subproblem 1
Set the factor '(-8 + -1x)' equal to zero and attempt to solve: Simplifying -8 + -1x = 0 Solving -8 + -1x = 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 + -1x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1x = 0 + 8 -1x = 0 + 8 Combine like terms: 0 + 8 = 8 -1x = 8 Divide each side by '-1'. x = -8 Simplifying x = -8Subproblem 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 = {-8, 5}
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