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Simplifying 7u2 + 51u + -40 = 0 Reorder the terms: -40 + 51u + 7u2 = 0 Solving -40 + 51u + 7u2 = 0 Solving for variable 'u'. Factor a trinomial. (-8 + -1u)(5 + -7u) = 0Subproblem 1
Set the factor '(-8 + -1u)' equal to zero and attempt to solve: Simplifying -8 + -1u = 0 Solving -8 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -1u = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1u = 0 + 8 -1u = 0 + 8 Combine like terms: 0 + 8 = 8 -1u = 8 Divide each side by '-1'. u = -8 Simplifying u = -8Subproblem 2
Set the factor '(5 + -7u)' equal to zero and attempt to solve: Simplifying 5 + -7u = 0 Solving 5 + -7u = 0 Move all terms containing u to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7u = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7u = 0 + -5 -7u = 0 + -5 Combine like terms: 0 + -5 = -5 -7u = -5 Divide each side by '-7'. u = 0.7142857143 Simplifying u = 0.7142857143Solution
u = {-8, 0.7142857143}
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