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Simplifying (5u + -4)(7 + u) = 0 Reorder the terms: (-4 + 5u)(7 + u) = 0 Multiply (-4 + 5u) * (7 + u) (-4(7 + u) + 5u * (7 + u)) = 0 ((7 * -4 + u * -4) + 5u * (7 + u)) = 0 ((-28 + -4u) + 5u * (7 + u)) = 0 (-28 + -4u + (7 * 5u + u * 5u)) = 0 (-28 + -4u + (35u + 5u2)) = 0 Combine like terms: -4u + 35u = 31u (-28 + 31u + 5u2) = 0 Solving -28 + 31u + 5u2 = 0 Solving for variable 'u'. Factor a trinomial. (-7 + -1u)(4 + -5u) = 0Subproblem 1
Set the factor '(-7 + -1u)' equal to zero and attempt to solve: Simplifying -7 + -1u = 0 Solving -7 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1u = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1u = 0 + 7 -1u = 0 + 7 Combine like terms: 0 + 7 = 7 -1u = 7 Divide each side by '-1'. u = -7 Simplifying u = -7Subproblem 2
Set the factor '(4 + -5u)' equal to zero and attempt to solve: Simplifying 4 + -5u = 0 Solving 4 + -5u = 0 Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5u = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5u = 0 + -4 -5u = 0 + -4 Combine like terms: 0 + -4 = -4 -5u = -4 Divide each side by '-5'. u = 0.8 Simplifying u = 0.8Solution
u = {-7, 0.8}
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