f^2+22f=20

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Solution for f^2+22f=20 equation:


Simplifying
f2 + 22f = 20

Reorder the terms:
22f + f2 = 20

Solving
22f + f2 = 20

Solving for variable 'f'.

Reorder the terms:
-20 + 22f + f2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 22f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 22f + 20 + f2 = 0 + 20

Reorder the terms:
-20 + 20 + 22f + f2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 22f + f2 = 0 + 20
22f + f2 = 0 + 20

Combine like terms: 0 + 20 = 20
22f + f2 = 20

The f term is 22f.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22f + 121 + f2 = 20 + 121

Reorder the terms:
121 + 22f + f2 = 20 + 121

Combine like terms: 20 + 121 = 141
121 + 22f + f2 = 141

Factor a perfect square on the left side:
(f + 11)(f + 11) = 141

Calculate the square root of the right side: 11.874342087

Break this problem into two subproblems by setting 
(f + 11) equal to 11.874342087 and -11.874342087.

Subproblem 1

f + 11 = 11.874342087 Simplifying f + 11 = 11.874342087 Reorder the terms: 11 + f = 11.874342087 Solving 11 + f = 11.874342087 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + f = 11.874342087 + -11 Combine like terms: 11 + -11 = 0 0 + f = 11.874342087 + -11 f = 11.874342087 + -11 Combine like terms: 11.874342087 + -11 = 0.874342087 f = 0.874342087 Simplifying f = 0.874342087

Subproblem 2

f + 11 = -11.874342087 Simplifying f + 11 = -11.874342087 Reorder the terms: 11 + f = -11.874342087 Solving 11 + f = -11.874342087 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + f = -11.874342087 + -11 Combine like terms: 11 + -11 = 0 0 + f = -11.874342087 + -11 f = -11.874342087 + -11 Combine like terms: -11.874342087 + -11 = -22.874342087 f = -22.874342087 Simplifying f = -22.874342087

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.874342087, -22.874342087}

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