(y+3)(y+9)=

Solution for (y+3)(y+9)= equation:

Simplifying
(y + 3)(y + 9) = 0

Reorder the terms:
(3 + y)(y + 9) = 0

Reorder the terms:
(3 + y)(9 + y) = 0

Multiply (3 + y) * (9 + y)
(3(9 + y) + y(9 + y)) = 0
((9 * 3 + y * 3) + y(9 + y)) = 0
((27 + 3y) + y(9 + y)) = 0
(27 + 3y + (9 * y + y * y)) = 0
(27 + 3y + (9y + y2)) = 0

Combine like terms: 3y + 9y = 12y
(27 + 12y + y2) = 0

Solving
27 + 12y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + y)(3 + y) = 0

Subproblem 1
Set the factor '(9 + y)' equal to zero and attempt to solve:

Simplifying
9 + y = 0

Solving
9 + y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + y = 0 + -9

Combine like terms: 9 + -9 = 0
0 + y = 0 + -9
y = 0 + -9

Combine like terms: 0 + -9 = -9
y = -9

Simplifying
y = -9
Subproblem 2
Set the factor '(3 + y)' equal to zero and attempt to solve:

Simplifying
3 + y = 0

Solving
3 + y = 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 + y = 0 + -3

Combine like terms: 3 + -3 = 0
0 + y = 0 + -3
y = 0 + -3

Combine like terms: 0 + -3 = -3
y = -3

Simplifying
y = -3
Solution
y = {-9, -3}