f^2-16f=-5

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Solution for f^2-16f=-5 equation:


Simplifying
f2 + -16f = -5

Reorder the terms:
-16f + f2 = -5

Solving
-16f + f2 = -5

Solving for variable 'f'.

Reorder the terms:
5 + -16f + f2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + -16f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -16f + -5 + f2 = 0 + -5

Reorder the terms:
5 + -5 + -16f + f2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -16f + f2 = 0 + -5
-16f + f2 = 0 + -5

Combine like terms: 0 + -5 = -5
-16f + f2 = -5

The f term is -16f.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16f + 64 + f2 = -5 + 64

Reorder the terms:
64 + -16f + f2 = -5 + 64

Combine like terms: -5 + 64 = 59
64 + -16f + f2 = 59

Factor a perfect square on the left side:
(f + -8)(f + -8) = 59

Calculate the square root of the right side: 7.681145748

Break this problem into two subproblems by setting 
(f + -8) equal to 7.681145748 and -7.681145748.

Subproblem 1

f + -8 = 7.681145748 Simplifying f + -8 = 7.681145748 Reorder the terms: -8 + f = 7.681145748 Solving -8 + f = 7.681145748 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + f = 7.681145748 + 8 Combine like terms: -8 + 8 = 0 0 + f = 7.681145748 + 8 f = 7.681145748 + 8 Combine like terms: 7.681145748 + 8 = 15.681145748 f = 15.681145748 Simplifying f = 15.681145748

Subproblem 2

f + -8 = -7.681145748 Simplifying f + -8 = -7.681145748 Reorder the terms: -8 + f = -7.681145748 Solving -8 + f = -7.681145748 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + f = -7.681145748 + 8 Combine like terms: -8 + 8 = 0 0 + f = -7.681145748 + 8 f = -7.681145748 + 8 Combine like terms: -7.681145748 + 8 = 0.318854252 f = 0.318854252 Simplifying f = 0.318854252

Solution

The solution to the problem is based on the solutions from the subproblems. f = {15.681145748, 0.318854252}

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