(4z+6)(9-z)=0

Solution for (4z+6)(9-z)=0 equation:

Simplifying
(4z + 6)(9 + -1z) = 0

Reorder the terms:
(6 + 4z)(9 + -1z) = 0

Multiply (6 + 4z) * (9 + -1z)
(6(9 + -1z) + 4z * (9 + -1z)) = 0
((9 * 6 + -1z * 6) + 4z * (9 + -1z)) = 0
((54 + -6z) + 4z * (9 + -1z)) = 0
(54 + -6z + (9 * 4z + -1z * 4z)) = 0
(54 + -6z + (36z + -4z2)) = 0

Combine like terms: -6z + 36z = 30z
(54 + 30z + -4z2) = 0

Solving
54 + 30z + -4z2 = 0

Solving for variable 'z'.

Factor out the Greatest Common Factor (GCF), '2'.
2(27 + 15z + -2z2) = 0

Factor a trinomial.
2((9 + -1z)(3 + 2z)) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(9 + -1z)' equal to zero and attempt to solve:

Simplifying
9 + -1z = 0

Solving
9 + -1z = 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 + -1z = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1z = 0 + -9
-1z = 0 + -9

Combine like terms: 0 + -9 = -9
-1z = -9

Divide each side by '-1'.
z = 9

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

Simplifying
3 + 2z = 0

Solving
3 + 2z = 0

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

Add '-3' to each side of the equation.
3 + -3 + 2z = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2z = 0 + -3
2z = 0 + -3

Combine like terms: 0 + -3 = -3
2z = -3

Divide each side by '2'.
z = -1.5

Simplifying
z = -1.5
Solution
z = {9, -1.5}