(5z-9)(8+z)=0

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Solution for (5z-9)(8+z)=0 equation: 


Simplifying
(5z + -9)(8 + z) = 0

Reorder the terms:
(-9 + 5z)(8 + z) = 0

Multiply (-9 + 5z) * (8 + z)
(-9(8 + z) + 5z * (8 + z)) = 0
((8 * -9 + z * -9) + 5z * (8 + z)) = 0
((-72 + -9z) + 5z * (8 + z)) = 0
(-72 + -9z + (8 * 5z + z * 5z)) = 0
(-72 + -9z + (40z + 5z2)) = 0

Combine like terms: -9z + 40z = 31z
(-72 + 31z + 5z2) = 0

Solving
-72 + 31z + 5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-8 + -1z)(9 + -5z) = 0


Subproblem 1
Set the factor '(-8 + -1z)' equal to zero and attempt to solve:

Simplifying
-8 + -1z = 0

Solving
-8 + -1z = 0

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

Add '8' to each side of the equation.
-8 + 8 + -1z = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1z = 0 + 8
-1z = 0 + 8

Combine like terms: 0 + 8 = 8
-1z = 8

Divide each side by '-1'.
z = -8

Simplifying
z = -8

Subproblem 2
Set the factor '(9 + -5z)' equal to zero and attempt to solve:

Simplifying
9 + -5z = 0

Solving
9 + -5z = 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 + -5z = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -5z = 0 + -9
-5z = 0 + -9

Combine like terms: 0 + -9 = -9
-5z = -9

Divide each side by '-5'.
z = 1.8

Simplifying
z = 1.8
Solution
z = {-8, 1.8}

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