(4u-5)(9+u)=0

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Solution for (4u-5)(9+u)=0 equation:


Simplifying
(4u + -5)(9 + u) = 0

Reorder the terms:
(-5 + 4u)(9 + u) = 0

Multiply (-5 + 4u) * (9 + u)
(-5(9 + u) + 4u * (9 + u)) = 0
((9 * -5 + u * -5) + 4u * (9 + u)) = 0
((-45 + -5u) + 4u * (9 + u)) = 0
(-45 + -5u + (9 * 4u + u * 4u)) = 0
(-45 + -5u + (36u + 4u2)) = 0

Combine like terms: -5u + 36u = 31u
(-45 + 31u + 4u2) = 0

Solving
-45 + 31u + 4u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-9 + -1u)(5 + -4u) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(5 + -4u)' equal to zero and attempt to solve: Simplifying 5 + -4u = 0 Solving 5 + -4u = 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 + -4u = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4u = 0 + -5 -4u = 0 + -5 Combine like terms: 0 + -5 = -5 -4u = -5 Divide each side by '-4'. u = 1.25 Simplifying u = 1.25

Solution

u = {-9, 1.25}

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