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

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Solution for (4u+1)(9-u)=0 equation:


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

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

Multiply (1 + 4u) * (9 + -1u)
(1(9 + -1u) + 4u * (9 + -1u)) = 0
((9 * 1 + -1u * 1) + 4u * (9 + -1u)) = 0
((9 + -1u) + 4u * (9 + -1u)) = 0
(9 + -1u + (9 * 4u + -1u * 4u)) = 0
(9 + -1u + (36u + -4u2)) = 0

Combine like terms: -1u + 36u = 35u
(9 + 35u + -4u2) = 0

Solving
9 + 35u + -4u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(9 + -1u)(1 + 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 '(1 + 4u)' equal to zero and attempt to solve: Simplifying 1 + 4u = 0 Solving 1 + 4u = 0 Move all terms containing u to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4u = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 4u = 0 + -1 4u = 0 + -1 Combine like terms: 0 + -1 = -1 4u = -1 Divide each side by '4'. u = -0.25 Simplifying u = -0.25

Solution

u = {9, -0.25}

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