(4u-9)(7-u)=0

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Solution for (4u-9)(7-u)=0 equation:


Simplifying
(4u + -9)(7 + -1u) = 0

Reorder the terms:
(-9 + 4u)(7 + -1u) = 0

Multiply (-9 + 4u) * (7 + -1u)
(-9(7 + -1u) + 4u * (7 + -1u)) = 0
((7 * -9 + -1u * -9) + 4u * (7 + -1u)) = 0
((-63 + 9u) + 4u * (7 + -1u)) = 0
(-63 + 9u + (7 * 4u + -1u * 4u)) = 0
(-63 + 9u + (28u + -4u2)) = 0

Combine like terms: 9u + 28u = 37u
(-63 + 37u + -4u2) = 0

Solving
-63 + 37u + -4u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-7 + u)(9 + -4u) = 0

Subproblem 1

Set the factor '(-7 + u)' equal to zero and attempt to solve: Simplifying -7 + u = 0 Solving -7 + u = 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 + u = 0 + 7 Combine like terms: -7 + 7 = 0 0 + u = 0 + 7 u = 0 + 7 Combine like terms: 0 + 7 = 7 u = 7 Simplifying u = 7

Subproblem 2

Set the factor '(9 + -4u)' equal to zero and attempt to solve: Simplifying 9 + -4u = 0 Solving 9 + -4u = 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 + -4u = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -4u = 0 + -9 -4u = 0 + -9 Combine like terms: 0 + -9 = -9 -4u = -9 Divide each side by '-4'. u = 2.25 Simplifying u = 2.25

Solution

u = {7, 2.25}

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