(9-y)(5y+2)=0

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Solution for (9-y)(5y+2)=0 equation:


Simplifying
(9 + -1y)(5y + 2) = 0

Reorder the terms:
(9 + -1y)(2 + 5y) = 0

Multiply (9 + -1y) * (2 + 5y)
(9(2 + 5y) + -1y * (2 + 5y)) = 0
((2 * 9 + 5y * 9) + -1y * (2 + 5y)) = 0
((18 + 45y) + -1y * (2 + 5y)) = 0
(18 + 45y + (2 * -1y + 5y * -1y)) = 0
(18 + 45y + (-2y + -5y2)) = 0

Combine like terms: 45y + -2y = 43y
(18 + 43y + -5y2) = 0

Solving
18 + 43y + -5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + -1y)(2 + 5y) = 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 + 5y)' equal to zero and attempt to solve: Simplifying 2 + 5y = 0 Solving 2 + 5y = 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 + 5y = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 5y = 0 + -2 5y = 0 + -2 Combine like terms: 0 + -2 = -2 5y = -2 Divide each side by '5'. y = -0.4 Simplifying y = -0.4

Solution

y = {9, -0.4}

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