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

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


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

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

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

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

Combine like terms: 3y + -9y = -6y
(-27 + -6y + y2) = 0

Solving
-27 + -6y + y2 = 0

Solving for variable 'y'.

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

Subproblem 1

Set the factor '(-3 + -1y)' equal to zero and attempt to solve: Simplifying -3 + -1y = 0 Solving -3 + -1y = 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 + -1y = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1y = 0 + 3 -1y = 0 + 3 Combine like terms: 0 + 3 = 3 -1y = 3 Divide each side by '-1'. y = -3 Simplifying y = -3

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 = {-3, 9}

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