(y+5)(y-9)=0

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Solution for (y+5)(y-9)=0 equation:


Simplifying
(y + 5)(y + -9) = 0

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

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

Multiply (5 + y) * (-9 + y)
(5(-9 + y) + y(-9 + y)) = 0
((-9 * 5 + y * 5) + y(-9 + y)) = 0
((-45 + 5y) + y(-9 + y)) = 0
(-45 + 5y + (-9 * y + y * y)) = 0
(-45 + 5y + (-9y + y2)) = 0

Combine like terms: 5y + -9y = -4y
(-45 + -4y + y2) = 0

Solving
-45 + -4y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-5 + -1y)(9 + -1y) = 0

Subproblem 1

Set the factor '(-5 + -1y)' equal to zero and attempt to solve: Simplifying -5 + -1y = 0 Solving -5 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1y = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1y = 0 + 5 -1y = 0 + 5 Combine like terms: 0 + 5 = 5 -1y = 5 Divide each side by '-1'. y = -5 Simplifying y = -5

Subproblem 2

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

Solution

y = {-5, 9}

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