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

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


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

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

Multiply (5 + -1y) * (9 + 5y)
(5(9 + 5y) + -1y * (9 + 5y)) = 0
((9 * 5 + 5y * 5) + -1y * (9 + 5y)) = 0
((45 + 25y) + -1y * (9 + 5y)) = 0
(45 + 25y + (9 * -1y + 5y * -1y)) = 0
(45 + 25y + (-9y + -5y2)) = 0

Combine like terms: 25y + -9y = 16y
(45 + 16y + -5y2) = 0

Solving
45 + 16y + -5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(5 + -1y)(9 + 5y) = 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 + 5y)' equal to zero and attempt to solve: Simplifying 9 + 5y = 0 Solving 9 + 5y = 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 + 5y = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 5y = 0 + -9 5y = 0 + -9 Combine like terms: 0 + -9 = -9 5y = -9 Divide each side by '5'. y = -1.8 Simplifying y = -1.8

Solution

y = {5, -1.8}

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