(y-1)(y+2)=4

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Solution for (y-1)(y+2)=4 equation:


Simplifying
(y + -1)(y + 2) = 4

Reorder the terms:
(-1 + y)(y + 2) = 4

Reorder the terms:
(-1 + y)(2 + y) = 4

Multiply (-1 + y) * (2 + y)
(-1(2 + y) + y(2 + y)) = 4
((2 * -1 + y * -1) + y(2 + y)) = 4
((-2 + -1y) + y(2 + y)) = 4
(-2 + -1y + (2 * y + y * y)) = 4
(-2 + -1y + (2y + y2)) = 4

Combine like terms: -1y + 2y = 1y
(-2 + 1y + y2) = 4

Solving
-2 + 1y + y2 = 4

Solving for variable 'y'.

Reorder the terms:
-2 + -4 + 1y + y2 = 4 + -4

Combine like terms: -2 + -4 = -6
-6 + 1y + y2 = 4 + -4

Combine like terms: 4 + -4 = 0
-6 + 1y + y2 = 0

Factor a trinomial.
(-3 + -1y)(2 + -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 '(2 + -1y)' equal to zero and attempt to solve: Simplifying 2 + -1y = 0 Solving 2 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1y = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1y = 0 + -2 -1y = 0 + -2 Combine like terms: 0 + -2 = -2 -1y = -2 Divide each side by '-1'. y = 2 Simplifying y = 2

Solution

y = {-3, 2}

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