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Simplifying (y + 9)(y + -4) = 0 Reorder the terms: (9 + y)(y + -4) = 0 Reorder the terms: (9 + y)(-4 + y) = 0 Multiply (9 + y) * (-4 + y) (9(-4 + y) + y(-4 + y)) = 0 ((-4 * 9 + y * 9) + y(-4 + y)) = 0 ((-36 + 9y) + y(-4 + y)) = 0 (-36 + 9y + (-4 * y + y * y)) = 0 (-36 + 9y + (-4y + y2)) = 0 Combine like terms: 9y + -4y = 5y (-36 + 5y + y2) = 0 Solving -36 + 5y + y2 = 0 Solving for variable 'y'. Factor a trinomial. (-9 + -1y)(4 + -1y) = 0Subproblem 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 = -9Subproblem 2
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 = 4Solution
y = {-9, 4}
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