7z^2-13z-2=0

Solution for 7z^2-13z-2=0 equation:

Simplifying
7z2 + -13z + -2 = 0

Reorder the terms:
-2 + -13z + 7z2 = 0

Solving
-2 + -13z + 7z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-1 + -7z)(2 + -1z) = 0

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

Simplifying
-1 + -7z = 0

Solving
-1 + -7z = 0

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

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

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

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

Divide each side by '-7'.
z = -0.1428571429

Simplifying
z = -0.1428571429
Subproblem 2
Set the factor '(2 + -1z)' equal to zero and attempt to solve:

Simplifying
2 + -1z = 0

Solving
2 + -1z = 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 + -1z = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1z = 0 + -2
-1z = 0 + -2

Combine like terms: 0 + -2 = -2
-1z = -2

Divide each side by '-1'.
z = 2

Simplifying
z = 2
Solution
z = {-0.1428571429, 2}