(9+z)(2z+5)=0

Solution for (9+z)(2z+5)=0 equation:

Simplifying
(9 + z)(2z + 5) = 0

Reorder the terms:
(9 + z)(5 + 2z) = 0

Multiply (9 + z) * (5 + 2z)
(9(5 + 2z) + z(5 + 2z)) = 0
((5 * 9 + 2z * 9) + z(5 + 2z)) = 0
((45 + 18z) + z(5 + 2z)) = 0
(45 + 18z + (5 * z + 2z * z)) = 0
(45 + 18z + (5z + 2z2)) = 0

Combine like terms: 18z + 5z = 23z
(45 + 23z + 2z2) = 0

Solving
45 + 23z + 2z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(9 + z)(5 + 2z) = 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 '(5 + 2z)' equal to zero and attempt to solve:

Simplifying
5 + 2z = 0

Solving
5 + 2z = 0

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

Add '-5' to each side of the equation.
5 + -5 + 2z = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 2z = 0 + -5
2z = 0 + -5

Combine like terms: 0 + -5 = -5
2z = -5

Divide each side by '2'.
z = -2.5

Simplifying
z = -2.5
Solution
z = {-9, -2.5}