(-2f^2-3f-5)+(-2f^2-3f+8)=0

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Solution for (-2f^2-3f-5)+(-2f^2-3f+8)=0 equation:


Simplifying
(-2f2 + -3f + -5) + (-2f2 + -3f + 8) = 0

Reorder the terms:
(-5 + -3f + -2f2) + (-2f2 + -3f + 8) = 0

Remove parenthesis around (-5 + -3f + -2f2)
-5 + -3f + -2f2 + (-2f2 + -3f + 8) = 0

Reorder the terms:
-5 + -3f + -2f2 + (8 + -3f + -2f2) = 0

Remove parenthesis around (8 + -3f + -2f2)
-5 + -3f + -2f2 + 8 + -3f + -2f2 = 0

Reorder the terms:
-5 + 8 + -3f + -3f + -2f2 + -2f2 = 0

Combine like terms: -5 + 8 = 3
3 + -3f + -3f + -2f2 + -2f2 = 0

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

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

Solving
3 + -6f + -4f2 = 0

Solving for variable 'f'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.75 + 1.5f + f2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 1.5f + 0.75 + f2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 1.5f + f2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 1.5f + f2 = 0 + 0.75
1.5f + f2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
1.5f + f2 = 0.75

The f term is 1.5f.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5f + 0.5625 + f2 = 0.75 + 0.5625

Reorder the terms:
0.5625 + 1.5f + f2 = 0.75 + 0.5625

Combine like terms: 0.75 + 0.5625 = 1.3125
0.5625 + 1.5f + f2 = 1.3125

Factor a perfect square on the left side:
(f + 0.75)(f + 0.75) = 1.3125

Calculate the square root of the right side: 1.145643924

Break this problem into two subproblems by setting 
(f + 0.75) equal to 1.145643924 and -1.145643924.

Subproblem 1

f + 0.75 = 1.145643924 Simplifying f + 0.75 = 1.145643924 Reorder the terms: 0.75 + f = 1.145643924 Solving 0.75 + f = 1.145643924 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + f = 1.145643924 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + f = 1.145643924 + -0.75 f = 1.145643924 + -0.75 Combine like terms: 1.145643924 + -0.75 = 0.395643924 f = 0.395643924 Simplifying f = 0.395643924

Subproblem 2

f + 0.75 = -1.145643924 Simplifying f + 0.75 = -1.145643924 Reorder the terms: 0.75 + f = -1.145643924 Solving 0.75 + f = -1.145643924 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + f = -1.145643924 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + f = -1.145643924 + -0.75 f = -1.145643924 + -0.75 Combine like terms: -1.145643924 + -0.75 = -1.895643924 f = -1.895643924 Simplifying f = -1.895643924

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.395643924, -1.895643924}

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