(y+1)(y+1)=0

Solution for (y+1)(y+1)=0 equation:

Simplifying
(y + 1)(y + 1) = 0

Reorder the terms:
(1 + y)(y + 1) = 0

Reorder the terms:
(1 + y)(1 + y) = 0

Multiply (1 + y) * (1 + y)
(1(1 + y) + y(1 + y)) = 0
((1 * 1 + y * 1) + y(1 + y)) = 0
((1 + 1y) + y(1 + y)) = 0
(1 + 1y + (1 * y + y * y)) = 0
(1 + 1y + (1y + y2)) = 0

Combine like terms: 1y + 1y = 2y
(1 + 2y + y2) = 0

Solving
1 + 2y + y2 = 0

Solving for variable 'y'.

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

Subproblem 1
Set the factor '(1 + y)' equal to zero and attempt to solve:

Simplifying
1 + y = 0

Solving
1 + y = 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 + y = 0 + -1

Combine like terms: 1 + -1 = 0
0 + y = 0 + -1
y = 0 + -1

Combine like terms: 0 + -1 = -1
y = -1

Simplifying
y = -1
Subproblem 2
Set the factor '(1 + y)' equal to zero and attempt to solve:

Simplifying
1 + y = 0

Solving
1 + y = 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 + y = 0 + -1

Combine like terms: 1 + -1 = 0
0 + y = 0 + -1
y = 0 + -1

Combine like terms: 0 + -1 = -1
y = -1

Simplifying
y = -1
Solution
y = {-1, -1}