f^2-6f-27=0

Solution for f^2-6f-27=0 equation:

Simplifying
f2 + -6f + -27 = 0

Reorder the terms:
-27 + -6f + f2 = 0

Solving
-27 + -6f + f2 = 0

Solving for variable 'f'.

Factor a trinomial.
(-3 + -1f)(9 + -1f) = 0

Subproblem 1
Set the factor '(-3 + -1f)' equal to zero and attempt to solve:

Simplifying
-3 + -1f = 0

Solving
-3 + -1f = 0

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

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

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

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

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

Simplifying
f = -3
Subproblem 2
Set the factor '(9 + -1f)' equal to zero and attempt to solve:

Simplifying
9 + -1f = 0

Solving
9 + -1f = 0

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

Add '-9' to each side of the equation.
9 + -9 + -1f = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1f = 0 + -9
-1f = 0 + -9

Combine like terms: 0 + -9 = -9
-1f = -9

Divide each side by '-1'.
f = 9

Simplifying
f = 9
Solution
f = {-3, 9}