f^2+28f=-5

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Solution for f^2+28f=-5 equation:


Simplifying
f2 + 28f = -5

Reorder the terms:
28f + f2 = -5

Solving
28f + f2 = -5

Solving for variable 'f'.

Reorder the terms:
5 + 28f + f2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + 28f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 28f + -5 + f2 = 0 + -5

Reorder the terms:
5 + -5 + 28f + f2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 28f + f2 = 0 + -5
28f + f2 = 0 + -5

Combine like terms: 0 + -5 = -5
28f + f2 = -5

The f term is 28f.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28f + 196 + f2 = -5 + 196

Reorder the terms:
196 + 28f + f2 = -5 + 196

Combine like terms: -5 + 196 = 191
196 + 28f + f2 = 191

Factor a perfect square on the left side:
(f + 14)(f + 14) = 191

Calculate the square root of the right side: 13.820274961

Break this problem into two subproblems by setting 
(f + 14) equal to 13.820274961 and -13.820274961.

Subproblem 1

f + 14 = 13.820274961 Simplifying f + 14 = 13.820274961 Reorder the terms: 14 + f = 13.820274961 Solving 14 + f = 13.820274961 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + f = 13.820274961 + -14 Combine like terms: 14 + -14 = 0 0 + f = 13.820274961 + -14 f = 13.820274961 + -14 Combine like terms: 13.820274961 + -14 = -0.179725039 f = -0.179725039 Simplifying f = -0.179725039

Subproblem 2

f + 14 = -13.820274961 Simplifying f + 14 = -13.820274961 Reorder the terms: 14 + f = -13.820274961 Solving 14 + f = -13.820274961 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + f = -13.820274961 + -14 Combine like terms: 14 + -14 = 0 0 + f = -13.820274961 + -14 f = -13.820274961 + -14 Combine like terms: -13.820274961 + -14 = -27.820274961 f = -27.820274961 Simplifying f = -27.820274961

Solution

The solution to the problem is based on the solutions from the subproblems. f = {-0.179725039, -27.820274961}

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