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

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


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

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

Multiply (1 + 3y) * (9 + -1y)
(1(9 + -1y) + 3y * (9 + -1y)) = 0
((9 * 1 + -1y * 1) + 3y * (9 + -1y)) = 0
((9 + -1y) + 3y * (9 + -1y)) = 0
(9 + -1y + (9 * 3y + -1y * 3y)) = 0
(9 + -1y + (27y + -3y2)) = 0

Combine like terms: -1y + 27y = 26y
(9 + 26y + -3y2) = 0

Solving
9 + 26y + -3y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + -1y)(1 + 3y) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(1 + 3y)' equal to zero and attempt to solve: Simplifying 1 + 3y = 0 Solving 1 + 3y = 0 Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3y = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 3y = 0 + -1 3y = 0 + -1 Combine like terms: 0 + -1 = -1 3y = -1 Divide each side by '3'. y = -0.3333333333 Simplifying y = -0.3333333333

Solution

y = {9, -0.3333333333}

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