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

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

Simplifying
(5z + 2)(5 + -1z) = 0

Reorder the terms:
(2 + 5z)(5 + -1z) = 0

Multiply (2 + 5z) * (5 + -1z)
(2(5 + -1z) + 5z * (5 + -1z)) = 0
((5 * 2 + -1z * 2) + 5z * (5 + -1z)) = 0
((10 + -2z) + 5z * (5 + -1z)) = 0
(10 + -2z + (5 * 5z + -1z * 5z)) = 0
(10 + -2z + (25z + -5z2)) = 0

Combine like terms: -2z + 25z = 23z
(10 + 23z + -5z2) = 0

Solving
10 + 23z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(5 + -1z)(2 + 5z) = 0

Subproblem 1
Set the factor '(5 + -1z)' equal to zero and attempt to solve:

Simplifying
5 + -1z = 0

Solving
5 + -1z = 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 + -1z = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1z = 0 + -5
-1z = 0 + -5

Combine like terms: 0 + -5 = -5
-1z = -5

Divide each side by '-1'.
z = 5

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

Simplifying
2 + 5z = 0

Solving
2 + 5z = 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 + 5z = 0 + -2

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

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

Divide each side by '5'.
z = -0.4

Simplifying
z = -0.4
Solution
z = {5, -0.4}