(y-4)(y-9)=0

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Solution for (y-4)(y-9)=0 equation:


Simplifying
(y + -4)(y + -9) = 0

Reorder the terms:
(-4 + y)(y + -9) = 0

Reorder the terms:
(-4 + y)(-9 + y) = 0

Multiply (-4 + y) * (-9 + y)
(-4(-9 + y) + y(-9 + y)) = 0
((-9 * -4 + y * -4) + y(-9 + y)) = 0
((36 + -4y) + y(-9 + y)) = 0
(36 + -4y + (-9 * y + y * y)) = 0
(36 + -4y + (-9y + y2)) = 0

Combine like terms: -4y + -9y = -13y
(36 + -13y + y2) = 0

Solving
36 + -13y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(4 + -1y)(9 + -1y) = 0

Subproblem 1

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 = 4

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 = {4, 9}

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