f(4+f)+4f=860

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Solution for f(4+f)+4f=860 equation:


Simplifying
f(4 + f) + 4f = 860
(4 * f + f * f) + 4f = 860
(4f + f2) + 4f = 860

Reorder the terms:
4f + 4f + f2 = 860

Combine like terms: 4f + 4f = 8f
8f + f2 = 860

Solving
8f + f2 = 860

Solving for variable 'f'.

Reorder the terms:
-860 + 8f + f2 = 860 + -860

Combine like terms: 860 + -860 = 0
-860 + 8f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '860' to each side of the equation.
-860 + 8f + 860 + f2 = 0 + 860

Reorder the terms:
-860 + 860 + 8f + f2 = 0 + 860

Combine like terms: -860 + 860 = 0
0 + 8f + f2 = 0 + 860
8f + f2 = 0 + 860

Combine like terms: 0 + 860 = 860
8f + f2 = 860

The f term is 8f.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8f + 16 + f2 = 860 + 16

Reorder the terms:
16 + 8f + f2 = 860 + 16

Combine like terms: 860 + 16 = 876
16 + 8f + f2 = 876

Factor a perfect square on the left side:
(f + 4)(f + 4) = 876

Calculate the square root of the right side: 29.597297174

Break this problem into two subproblems by setting 
(f + 4) equal to 29.597297174 and -29.597297174.

Subproblem 1

f + 4 = 29.597297174 Simplifying f + 4 = 29.597297174 Reorder the terms: 4 + f = 29.597297174 Solving 4 + f = 29.597297174 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + f = 29.597297174 + -4 Combine like terms: 4 + -4 = 0 0 + f = 29.597297174 + -4 f = 29.597297174 + -4 Combine like terms: 29.597297174 + -4 = 25.597297174 f = 25.597297174 Simplifying f = 25.597297174

Subproblem 2

f + 4 = -29.597297174 Simplifying f + 4 = -29.597297174 Reorder the terms: 4 + f = -29.597297174 Solving 4 + f = -29.597297174 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + f = -29.597297174 + -4 Combine like terms: 4 + -4 = 0 0 + f = -29.597297174 + -4 f = -29.597297174 + -4 Combine like terms: -29.597297174 + -4 = -33.597297174 f = -33.597297174 Simplifying f = -33.597297174

Solution

The solution to the problem is based on the solutions from the subproblems. f = {25.597297174, -33.597297174}

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