21v^2-81v+54=0

Solution for 21v^2-81v+54=0 equation:

Simplifying
21v2 + -81v + 54 = 0

Reorder the terms:
54 + -81v + 21v2 = 0

Solving
54 + -81v + 21v2 = 0

Solving for variable 'v'.

Factor out the Greatest Common Factor (GCF), '3'.
3(18 + -27v + 7v2) = 0

Factor a trinomial.
3((6 + -7v)(3 + -1v)) = 0

Ignore the factor 3.
Subproblem 1
Set the factor '(6 + -7v)' equal to zero and attempt to solve:

Simplifying
6 + -7v = 0

Solving
6 + -7v = 0

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

Add '-6' to each side of the equation.
6 + -6 + -7v = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -7v = 0 + -6
-7v = 0 + -6

Combine like terms: 0 + -6 = -6
-7v = -6

Divide each side by '-7'.
v = 0.8571428571

Simplifying
v = 0.8571428571
Subproblem 2
Set the factor '(3 + -1v)' equal to zero and attempt to solve:

Simplifying
3 + -1v = 0

Solving
3 + -1v = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1v = 0 + -3

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

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

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

Simplifying
v = 3
Solution
v = {0.8571428571, 3}