(5z+8)(7-z)=0

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Solution for (5z+8)(7-z)=0 equation: 


Simplifying
(5z + 8)(7 + -1z) = 0

Reorder the terms:
(8 + 5z)(7 + -1z) = 0

Multiply (8 + 5z) * (7 + -1z)
(8(7 + -1z) + 5z * (7 + -1z)) = 0
((7 * 8 + -1z * 8) + 5z * (7 + -1z)) = 0
((56 + -8z) + 5z * (7 + -1z)) = 0
(56 + -8z + (7 * 5z + -1z * 5z)) = 0
(56 + -8z + (35z + -5z2)) = 0

Combine like terms: -8z + 35z = 27z
(56 + 27z + -5z2) = 0

Solving
56 + 27z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(7 + -1z)(8 + 5z) = 0


Subproblem 1
Set the factor '(7 + -1z)' equal to zero and attempt to solve:

Simplifying
7 + -1z = 0

Solving
7 + -1z = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1z = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1z = 0 + -7
-1z = 0 + -7

Combine like terms: 0 + -7 = -7
-1z = -7

Divide each side by '-1'.
z = 7

Simplifying
z = 7

Subproblem 2
Set the factor '(8 + 5z)' equal to zero and attempt to solve:

Simplifying
8 + 5z = 0

Solving
8 + 5z = 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 + 5z = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 5z = 0 + -8
5z = 0 + -8

Combine like terms: 0 + -8 = -8
5z = -8

Divide each side by '5'.
z = -1.6

Simplifying
z = -1.6
Solution
z = {7, -1.6}

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