(1-y)(2+y)=0

Solution for (1-y)(2+y)=0 equation:

Simplifying
(1 + -1y)(2 + y) = 0

Multiply (1 + -1y) * (2 + y)
(1(2 + y) + -1y * (2 + y)) = 0
((2 * 1 + y * 1) + -1y * (2 + y)) = 0
((2 + 1y) + -1y * (2 + y)) = 0
(2 + 1y + (2 * -1y + y * -1y)) = 0
(2 + 1y + (-2y + -1y2)) = 0

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

Solving
2 + -1y + -1y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(1 + -1y)(2 + y) = 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 '(2 + y)' equal to zero and attempt to solve:

Simplifying
2 + y = 0

Solving
2 + y = 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 + y = 0 + -2

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

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

Simplifying
y = -2
Solution
y = {1, -2}