5z^2-9z-18=0

Solution for 5z^2-9z-18=0 equation:

Simplifying
5z2 + -9z + -18 = 0

Reorder the terms:
-18 + -9z + 5z2 = 0

Solving
-18 + -9z + 5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-6 + -5z)(3 + -1z) = 0

Subproblem 1
Set the factor '(-6 + -5z)' equal to zero and attempt to solve:

Simplifying
-6 + -5z = 0

Solving
-6 + -5z = 0

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

Add '6' to each side of the equation.
-6 + 6 + -5z = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -5z = 0 + 6
-5z = 0 + 6

Combine like terms: 0 + 6 = 6
-5z = 6

Divide each side by '-5'.
z = -1.2

Simplifying
z = -1.2
Subproblem 2
Set the factor '(3 + -1z)' equal to zero and attempt to solve:

Simplifying
3 + -1z = 0

Solving
3 + -1z = 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 + -1z = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1z = 0 + -3
-1z = 0 + -3

Combine like terms: 0 + -3 = -3
-1z = -3

Divide each side by '-1'.
z = 3

Simplifying
z = 3
Solution
z = {-1.2, 3}