28z^2-11z+1=0

Solution for 28z^2-11z+1=0 equation:

Simplifying
28z2 + -11z + 1 = 0

Reorder the terms:
1 + -11z + 28z2 = 0

Solving
1 + -11z + 28z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(1 + -7z)(1 + -4z) = 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 '(1 + -4z)' equal to zero and attempt to solve:

Simplifying
1 + -4z = 0

Solving
1 + -4z = 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 + -4z = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4z = 0 + -1
-4z = 0 + -1

Combine like terms: 0 + -1 = -1
-4z = -1

Divide each side by '-4'.
z = 0.25

Simplifying
z = 0.25
Solution
z = {0.1428571429, 0.25}