f^2-8f-11=0

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Solution for f^2-8f-11=0 equation:


Simplifying
f2 + -8f + -11 = 0

Reorder the terms:
-11 + -8f + f2 = 0

Solving
-11 + -8f + f2 = 0

Solving for variable 'f'.

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -8f + 11 + f2 = 0 + 11

Reorder the terms:
-11 + 11 + -8f + f2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -8f + f2 = 0 + 11
-8f + f2 = 0 + 11

Combine like terms: 0 + 11 = 11
-8f + f2 = 11

The f term is -8f.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8f + 16 + f2 = 11 + 16

Reorder the terms:
16 + -8f + f2 = 11 + 16

Combine like terms: 11 + 16 = 27
16 + -8f + f2 = 27

Factor a perfect square on the left side:
(f + -4)(f + -4) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(f + -4) equal to 5.196152423 and -5.196152423.

Subproblem 1

f + -4 = 5.196152423 Simplifying f + -4 = 5.196152423 Reorder the terms: -4 + f = 5.196152423 Solving -4 + f = 5.196152423 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + f = 5.196152423 + 4 Combine like terms: -4 + 4 = 0 0 + f = 5.196152423 + 4 f = 5.196152423 + 4 Combine like terms: 5.196152423 + 4 = 9.196152423 f = 9.196152423 Simplifying f = 9.196152423

Subproblem 2

f + -4 = -5.196152423 Simplifying f + -4 = -5.196152423 Reorder the terms: -4 + f = -5.196152423 Solving -4 + f = -5.196152423 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + f = -5.196152423 + 4 Combine like terms: -4 + 4 = 0 0 + f = -5.196152423 + 4 f = -5.196152423 + 4 Combine like terms: -5.196152423 + 4 = -1.196152423 f = -1.196152423 Simplifying f = -1.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. f = {9.196152423, -1.196152423}

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