y^2-y-21=2y-3

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Solution for y^2-y-21=2y-3 equation:


Simplifying
y2 + -1y + -21 = 2y + -3

Reorder the terms:
-21 + -1y + y2 = 2y + -3

Reorder the terms:
-21 + -1y + y2 = -3 + 2y

Solving
-21 + -1y + y2 = -3 + 2y

Solving for variable 'y'.

Reorder the terms:
-21 + 3 + -1y + -2y + y2 = -3 + 2y + 3 + -2y

Combine like terms: -21 + 3 = -18
-18 + -1y + -2y + y2 = -3 + 2y + 3 + -2y

Combine like terms: -1y + -2y = -3y
-18 + -3y + y2 = -3 + 2y + 3 + -2y

Reorder the terms:
-18 + -3y + y2 = -3 + 3 + 2y + -2y

Combine like terms: -3 + 3 = 0
-18 + -3y + y2 = 0 + 2y + -2y
-18 + -3y + y2 = 2y + -2y

Combine like terms: 2y + -2y = 0
-18 + -3y + y2 = 0

Factor a trinomial.
(-3 + -1y)(6 + -1y) = 0

Subproblem 1

Set the factor '(-3 + -1y)' equal to zero and attempt to solve: Simplifying -3 + -1y = 0 Solving -3 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1y = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1y = 0 + 3 -1y = 0 + 3 Combine like terms: 0 + 3 = 3 -1y = 3 Divide each side by '-1'. y = -3 Simplifying y = -3

Subproblem 2

Set the factor '(6 + -1y)' equal to zero and attempt to solve: Simplifying 6 + -1y = 0 Solving 6 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1y = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1y = 0 + -6 -1y = 0 + -6 Combine like terms: 0 + -6 = -6 -1y = -6 Divide each side by '-1'. y = 6 Simplifying y = 6

Solution

y = {-3, 6}

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