(13-y)*y=40

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Solution for (13-y)*y=40 equation:


Simplifying
(13 + -1y) * y = 40

Reorder the terms for easier multiplication:
y(13 + -1y) = 40
(13 * y + -1y * y) = 40
(13y + -1y2) = 40

Solving
13y + -1y2 = 40

Solving for variable 'y'.

Reorder the terms:
-40 + 13y + -1y2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 13y + -1y2 = 0

Factor a trinomial.
(-8 + y)(5 + -1y) = 0

Subproblem 1

Set the factor '(-8 + y)' equal to zero and attempt to solve: Simplifying -8 + y = 0 Solving -8 + y = 0 Move all terms containing y to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + y = 0 + 8 Combine like terms: -8 + 8 = 0 0 + y = 0 + 8 y = 0 + 8 Combine like terms: 0 + 8 = 8 y = 8 Simplifying y = 8

Subproblem 2

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

Solution

y = {8, 5}

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