y^2-90=13*y

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Solution for y^2-90=13*y equation:


Simplifying
y2 + -90 = 13y

Reorder the terms:
-90 + y2 = 13y

Solving
-90 + y2 = 13y

Solving for variable 'y'.

Reorder the terms:
-90 + -13y + y2 = 13y + -13y

Combine like terms: 13y + -13y = 0
-90 + -13y + y2 = 0

Factor a trinomial.
(-5 + -1y)(18 + -1y) = 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 '(18 + -1y)' equal to zero and attempt to solve: Simplifying 18 + -1y = 0 Solving 18 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1y = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1y = 0 + -18 -1y = 0 + -18 Combine like terms: 0 + -18 = -18 -1y = -18 Divide each side by '-1'. y = 18 Simplifying y = 18

Solution

y = {-5, 18}

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