(9-u)(3u+1)=0

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Solution for (9-u)(3u+1)=0 equation:


Simplifying
(9 + -1u)(3u + 1) = 0

Reorder the terms:
(9 + -1u)(1 + 3u) = 0

Multiply (9 + -1u) * (1 + 3u)
(9(1 + 3u) + -1u * (1 + 3u)) = 0
((1 * 9 + 3u * 9) + -1u * (1 + 3u)) = 0
((9 + 27u) + -1u * (1 + 3u)) = 0
(9 + 27u + (1 * -1u + 3u * -1u)) = 0
(9 + 27u + (-1u + -3u2)) = 0

Combine like terms: 27u + -1u = 26u
(9 + 26u + -3u2) = 0

Solving
9 + 26u + -3u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(9 + -1u)(1 + 3u) = 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 + 3u)' equal to zero and attempt to solve: Simplifying 1 + 3u = 0 Solving 1 + 3u = 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 + 3u = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 3u = 0 + -1 3u = 0 + -1 Combine like terms: 0 + -1 = -1 3u = -1 Divide each side by '3'. u = -0.3333333333 Simplifying u = -0.3333333333

Solution

u = {9, -0.3333333333}

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