y^2-2y=99

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Solution for y^2-2y=99 equation:


Simplifying
y2 + -2y = 99

Reorder the terms:
-2y + y2 = 99

Solving
-2y + y2 = 99

Solving for variable 'y'.

Reorder the terms:
-99 + -2y + y2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + -2y + y2 = 0

Factor a trinomial.
(-9 + -1y)(11 + -1y) = 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 '(11 + -1y)' equal to zero and attempt to solve: Simplifying 11 + -1y = 0 Solving 11 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1y = 0 + -11 Combine like terms: 11 + -11 = 0 0 + -1y = 0 + -11 -1y = 0 + -11 Combine like terms: 0 + -11 = -11 -1y = -11 Divide each side by '-1'. y = 11 Simplifying y = 11

Solution

y = {-9, 11}

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