(3f^2-f+7f)+(2f^2-3f-4)=

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Solution for (3f^2-f+7f)+(2f^2-3f-4)= equation:


Simplifying
(3f2 + -1f + 7f) + (2f2 + -3f + -4) = 0

Reorder the terms:
(-1f + 7f + 3f2) + (2f2 + -3f + -4) = 0

Combine like terms: -1f + 7f = 6f
(6f + 3f2) + (2f2 + -3f + -4) = 0

Remove parenthesis around (6f + 3f2)
6f + 3f2 + (2f2 + -3f + -4) = 0

Reorder the terms:
6f + 3f2 + (-4 + -3f + 2f2) = 0

Remove parenthesis around (-4 + -3f + 2f2)
6f + 3f2 + -4 + -3f + 2f2 = 0

Reorder the terms:
-4 + 6f + -3f + 3f2 + 2f2 = 0

Combine like terms: 6f + -3f = 3f
-4 + 3f + 3f2 + 2f2 = 0

Combine like terms: 3f2 + 2f2 = 5f2
-4 + 3f + 5f2 = 0

Solving
-4 + 3f + 5f2 = 0

Solving for variable 'f'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-0.8 + 0.6f + f2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 0.6f + 0.8 + f2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 0.6f + f2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 0.6f + f2 = 0 + 0.8
0.6f + f2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
0.6f + f2 = 0.8

The f term is 0.6f.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6f + 0.09 + f2 = 0.8 + 0.09

Reorder the terms:
0.09 + 0.6f + f2 = 0.8 + 0.09

Combine like terms: 0.8 + 0.09 = 0.89
0.09 + 0.6f + f2 = 0.89

Factor a perfect square on the left side:
(f + 0.3)(f + 0.3) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(f + 0.3) equal to 0.943398113 and -0.943398113.

Subproblem 1

f + 0.3 = 0.943398113 Simplifying f + 0.3 = 0.943398113 Reorder the terms: 0.3 + f = 0.943398113 Solving 0.3 + f = 0.943398113 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + f = 0.943398113 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + f = 0.943398113 + -0.3 f = 0.943398113 + -0.3 Combine like terms: 0.943398113 + -0.3 = 0.643398113 f = 0.643398113 Simplifying f = 0.643398113

Subproblem 2

f + 0.3 = -0.943398113 Simplifying f + 0.3 = -0.943398113 Reorder the terms: 0.3 + f = -0.943398113 Solving 0.3 + f = -0.943398113 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + f = -0.943398113 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + f = -0.943398113 + -0.3 f = -0.943398113 + -0.3 Combine like terms: -0.943398113 + -0.3 = -1.243398113 f = -1.243398113 Simplifying f = -1.243398113

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.643398113, -1.243398113}

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