f^2=20f-16

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Solution for f^2=20f-16 equation:


Simplifying
f2 = 20f + -16

Reorder the terms:
f2 = -16 + 20f

Solving
f2 = -16 + 20f

Solving for variable 'f'.

Reorder the terms:
16 + -20f + f2 = -16 + 20f + 16 + -20f

Reorder the terms:
16 + -20f + f2 = -16 + 16 + 20f + -20f

Combine like terms: -16 + 16 = 0
16 + -20f + f2 = 0 + 20f + -20f
16 + -20f + f2 = 20f + -20f

Combine like terms: 20f + -20f = 0
16 + -20f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -20f + -16 + f2 = 0 + -16

Reorder the terms:
16 + -16 + -20f + f2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -20f + f2 = 0 + -16
-20f + f2 = 0 + -16

Combine like terms: 0 + -16 = -16
-20f + f2 = -16

The f term is -20f.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20f + 100 + f2 = -16 + 100

Reorder the terms:
100 + -20f + f2 = -16 + 100

Combine like terms: -16 + 100 = 84
100 + -20f + f2 = 84

Factor a perfect square on the left side:
(f + -10)(f + -10) = 84

Calculate the square root of the right side: 9.16515139

Break this problem into two subproblems by setting 
(f + -10) equal to 9.16515139 and -9.16515139.

Subproblem 1

f + -10 = 9.16515139 Simplifying f + -10 = 9.16515139 Reorder the terms: -10 + f = 9.16515139 Solving -10 + f = 9.16515139 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + f = 9.16515139 + 10 Combine like terms: -10 + 10 = 0 0 + f = 9.16515139 + 10 f = 9.16515139 + 10 Combine like terms: 9.16515139 + 10 = 19.16515139 f = 19.16515139 Simplifying f = 19.16515139

Subproblem 2

f + -10 = -9.16515139 Simplifying f + -10 = -9.16515139 Reorder the terms: -10 + f = -9.16515139 Solving -10 + f = -9.16515139 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + f = -9.16515139 + 10 Combine like terms: -10 + 10 = 0 0 + f = -9.16515139 + 10 f = -9.16515139 + 10 Combine like terms: -9.16515139 + 10 = 0.83484861 f = 0.83484861 Simplifying f = 0.83484861

Solution

The solution to the problem is based on the solutions from the subproblems. f = {19.16515139, 0.83484861}

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