(2z+5)(2z-3)=

Solution for (2z+5)(2z-3)= equation:

Simplifying
(2z + 5)(2z + -3) = 0

Reorder the terms:
(5 + 2z)(2z + -3) = 0

Reorder the terms:
(5 + 2z)(-3 + 2z) = 0

Multiply (5 + 2z) * (-3 + 2z)
(5(-3 + 2z) + 2z * (-3 + 2z)) = 0
((-3 * 5 + 2z * 5) + 2z * (-3 + 2z)) = 0
((-15 + 10z) + 2z * (-3 + 2z)) = 0
(-15 + 10z + (-3 * 2z + 2z * 2z)) = 0
(-15 + 10z + (-6z + 4z2)) = 0

Combine like terms: 10z + -6z = 4z
(-15 + 4z + 4z2) = 0

Solving
-15 + 4z + 4z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-5 + -2z)(3 + -2z) = 0

Subproblem 1
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
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 = {-2.5, 1.5}