(y+9)(y-2)=0

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Solution for (y+9)(y-2)=0 equation:


Simplifying
(y + 9)(y + -2) = 0

Reorder the terms:
(9 + y)(y + -2) = 0

Reorder the terms:
(9 + y)(-2 + y) = 0

Multiply (9 + y) * (-2 + y)
(9(-2 + y) + y(-2 + y)) = 0
((-2 * 9 + y * 9) + y(-2 + y)) = 0
((-18 + 9y) + y(-2 + y)) = 0
(-18 + 9y + (-2 * y + y * y)) = 0
(-18 + 9y + (-2y + y2)) = 0

Combine like terms: 9y + -2y = 7y
(-18 + 7y + y2) = 0

Solving
-18 + 7y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + -1y)(2 + -1y) = 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 '(2 + -1y)' equal to zero and attempt to solve: Simplifying 2 + -1y = 0 Solving 2 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1y = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1y = 0 + -2 -1y = 0 + -2 Combine like terms: 0 + -2 = -2 -1y = -2 Divide each side by '-1'. y = 2 Simplifying y = 2

Solution

y = {-9, 2}

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