2f^2-5f-10=0

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Solution for 2f^2-5f-10=0 equation:


Simplifying
2f2 + -5f + -10 = 0

Reorder the terms:
-10 + -5f + 2f2 = 0

Solving
-10 + -5f + 2f2 = 0

Solving for variable 'f'.

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

Divide each side by '2'.
-5 + -2.5f + f2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2.5f + 5 + f2 = 0 + 5

Reorder the terms:
-5 + 5 + -2.5f + f2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2.5f + f2 = 0 + 5
-2.5f + f2 = 0 + 5

Combine like terms: 0 + 5 = 5
-2.5f + f2 = 5

The f term is -2.5f.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5f + 1.5625 + f2 = 5 + 1.5625

Reorder the terms:
1.5625 + -2.5f + f2 = 5 + 1.5625

Combine like terms: 5 + 1.5625 = 6.5625
1.5625 + -2.5f + f2 = 6.5625

Factor a perfect square on the left side:
(f + -1.25)(f + -1.25) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(f + -1.25) equal to 2.561737691 and -2.561737691.

Subproblem 1

f + -1.25 = 2.561737691 Simplifying f + -1.25 = 2.561737691 Reorder the terms: -1.25 + f = 2.561737691 Solving -1.25 + f = 2.561737691 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + f = 2.561737691 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + f = 2.561737691 + 1.25 f = 2.561737691 + 1.25 Combine like terms: 2.561737691 + 1.25 = 3.811737691 f = 3.811737691 Simplifying f = 3.811737691

Subproblem 2

f + -1.25 = -2.561737691 Simplifying f + -1.25 = -2.561737691 Reorder the terms: -1.25 + f = -2.561737691 Solving -1.25 + f = -2.561737691 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + f = -2.561737691 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + f = -2.561737691 + 1.25 f = -2.561737691 + 1.25 Combine like terms: -2.561737691 + 1.25 = -1.311737691 f = -1.311737691 Simplifying f = -1.311737691

Solution

The solution to the problem is based on the solutions from the subproblems. f = {3.811737691, -1.311737691}

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