y^2-4y=4-y

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Solution for y^2-4y=4-y equation:


Simplifying
y2 + -4y = 4 + -1y

Reorder the terms:
-4y + y2 = 4 + -1y

Solving
-4y + y2 = 4 + -1y

Solving for variable 'y'.

Reorder the terms:
-4 + -4y + y + y2 = 4 + -1y + -4 + y

Combine like terms: -4y + y = -3y
-4 + -3y + y2 = 4 + -1y + -4 + y

Reorder the terms:
-4 + -3y + y2 = 4 + -4 + -1y + y

Combine like terms: 4 + -4 = 0
-4 + -3y + y2 = 0 + -1y + y
-4 + -3y + y2 = -1y + y

Combine like terms: -1y + y = 0
-4 + -3y + y2 = 0

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

Subproblem 1

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

Subproblem 2

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

Solution

y = {-1, 4}

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