f^2-16f=9

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Solution for f^2-16f=9 equation:


Simplifying
f2 + -16f = 9

Reorder the terms:
-16f + f2 = 9

Solving
-16f + f2 = 9

Solving for variable 'f'.

Reorder the terms:
-9 + -16f + f2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -16f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -16f + 9 + f2 = 0 + 9

Reorder the terms:
-9 + 9 + -16f + f2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -16f + f2 = 0 + 9
-16f + f2 = 0 + 9

Combine like terms: 0 + 9 = 9
-16f + f2 = 9

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 = 9 + 64

Reorder the terms:
64 + -16f + f2 = 9 + 64

Combine like terms: 9 + 64 = 73
64 + -16f + f2 = 73

Factor a perfect square on the left side:
(f + -8)(f + -8) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(f + -8) equal to 8.544003745 and -8.544003745.

Subproblem 1

f + -8 = 8.544003745 Simplifying f + -8 = 8.544003745 Reorder the terms: -8 + f = 8.544003745 Solving -8 + f = 8.544003745 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 = 8.544003745 + 8 Combine like terms: -8 + 8 = 0 0 + f = 8.544003745 + 8 f = 8.544003745 + 8 Combine like terms: 8.544003745 + 8 = 16.544003745 f = 16.544003745 Simplifying f = 16.544003745

Subproblem 2

f + -8 = -8.544003745 Simplifying f + -8 = -8.544003745 Reorder the terms: -8 + f = -8.544003745 Solving -8 + f = -8.544003745 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 = -8.544003745 + 8 Combine like terms: -8 + 8 = 0 0 + f = -8.544003745 + 8 f = -8.544003745 + 8 Combine like terms: -8.544003745 + 8 = -0.544003745 f = -0.544003745 Simplifying f = -0.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. f = {16.544003745, -0.544003745}

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