(z+2)(z+9)=0

Solution for (z+2)(z+9)=0 equation:

Simplifying
(z + 2)(z + 9) = 0

Reorder the terms:
(2 + z)(z + 9) = 0

Reorder the terms:
(2 + z)(9 + z) = 0

Multiply (2 + z) * (9 + z)
(2(9 + z) + z(9 + z)) = 0
((9 * 2 + z * 2) + z(9 + z)) = 0
((18 + 2z) + z(9 + z)) = 0
(18 + 2z + (9 * z + z * z)) = 0
(18 + 2z + (9z + z2)) = 0

Combine like terms: 2z + 9z = 11z
(18 + 11z + z2) = 0

Solving
18 + 11z + z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(9 + z)(2 + z) = 0

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

Simplifying
9 + z = 0

Solving
9 + z = 0

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

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

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

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

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

Simplifying
2 + z = 0

Solving
2 + z = 0

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

Add '-2' to each side of the equation.
2 + -2 + z = 0 + -2

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

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

Simplifying
z = -2
Solution
z = {-9, -2}