(y+3)(2y-1)=9

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Solution for (y+3)(2y-1)=9 equation:


Simplifying
(y + 3)(2y + -1) = 9

Reorder the terms:
(3 + y)(2y + -1) = 9

Reorder the terms:
(3 + y)(-1 + 2y) = 9

Multiply (3 + y) * (-1 + 2y)
(3(-1 + 2y) + y(-1 + 2y)) = 9
((-1 * 3 + 2y * 3) + y(-1 + 2y)) = 9
((-3 + 6y) + y(-1 + 2y)) = 9
(-3 + 6y + (-1 * y + 2y * y)) = 9
(-3 + 6y + (-1y + 2y2)) = 9

Combine like terms: 6y + -1y = 5y
(-3 + 5y + 2y2) = 9

Solving
-3 + 5y + 2y2 = 9

Solving for variable 'y'.

Reorder the terms:
-3 + -9 + 5y + 2y2 = 9 + -9

Combine like terms: -3 + -9 = -12
-12 + 5y + 2y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-12 + 5y + 2y2 = 0

Factor a trinomial.
(-4 + -1y)(3 + -2y) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -2y)' equal to zero and attempt to solve: Simplifying 3 + -2y = 0 Solving 3 + -2y = 0 Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2y = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2y = 0 + -3 -2y = 0 + -3 Combine like terms: 0 + -3 = -3 -2y = -3 Divide each side by '-2'. y = 1.5 Simplifying y = 1.5

Solution

y = {-4, 1.5}

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