(u+5)(u-9)=0

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Solution for (u+5)(u-9)=0 equation:


Simplifying
(u + 5)(u + -9) = 0

Reorder the terms:
(5 + u)(u + -9) = 0

Reorder the terms:
(5 + u)(-9 + u) = 0

Multiply (5 + u) * (-9 + u)
(5(-9 + u) + u(-9 + u)) = 0
((-9 * 5 + u * 5) + u(-9 + u)) = 0
((-45 + 5u) + u(-9 + u)) = 0
(-45 + 5u + (-9 * u + u * u)) = 0
(-45 + 5u + (-9u + u2)) = 0

Combine like terms: 5u + -9u = -4u
(-45 + -4u + u2) = 0

Solving
-45 + -4u + u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-5 + -1u)(9 + -1u) = 0

Subproblem 1

Set the factor '(-5 + -1u)' equal to zero and attempt to solve: Simplifying -5 + -1u = 0 Solving -5 + -1u = 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 + -1u = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1u = 0 + 5 -1u = 0 + 5 Combine like terms: 0 + 5 = 5 -1u = 5 Divide each side by '-1'. u = -5 Simplifying u = -5

Subproblem 2

Set the factor '(9 + -1u)' equal to zero and attempt to solve: Simplifying 9 + -1u = 0 Solving 9 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1u = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1u = 0 + -9 -1u = 0 + -9 Combine like terms: 0 + -9 = -9 -1u = -9 Divide each side by '-1'. u = 9 Simplifying u = 9

Solution

u = {-5, 9}

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