f(f+6)=30

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Solution for f(f+6)=30 equation:


Simplifying
f(f + 6) = 30

Reorder the terms:
f(6 + f) = 30
(6 * f + f * f) = 30
(6f + f2) = 30

Solving
6f + f2 = 30

Solving for variable 'f'.

Reorder the terms:
-30 + 6f + f2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 6f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 6f + 30 + f2 = 0 + 30

Reorder the terms:
-30 + 30 + 6f + f2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 6f + f2 = 0 + 30
6f + f2 = 0 + 30

Combine like terms: 0 + 30 = 30
6f + f2 = 30

The f term is 6f.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6f + 9 + f2 = 30 + 9

Reorder the terms:
9 + 6f + f2 = 30 + 9

Combine like terms: 30 + 9 = 39
9 + 6f + f2 = 39

Factor a perfect square on the left side:
(f + 3)(f + 3) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(f + 3) equal to 6.244997998 and -6.244997998.

Subproblem 1

f + 3 = 6.244997998 Simplifying f + 3 = 6.244997998 Reorder the terms: 3 + f = 6.244997998 Solving 3 + f = 6.244997998 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + f = 6.244997998 + -3 Combine like terms: 3 + -3 = 0 0 + f = 6.244997998 + -3 f = 6.244997998 + -3 Combine like terms: 6.244997998 + -3 = 3.244997998 f = 3.244997998 Simplifying f = 3.244997998

Subproblem 2

f + 3 = -6.244997998 Simplifying f + 3 = -6.244997998 Reorder the terms: 3 + f = -6.244997998 Solving 3 + f = -6.244997998 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + f = -6.244997998 + -3 Combine like terms: 3 + -3 = 0 0 + f = -6.244997998 + -3 f = -6.244997998 + -3 Combine like terms: -6.244997998 + -3 = -9.244997998 f = -9.244997998 Simplifying f = -9.244997998

Solution

The solution to the problem is based on the solutions from the subproblems. f = {3.244997998, -9.244997998}

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