f^2-5f-4=0

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Solution for f^2-5f-4=0 equation:


Simplifying
f2 + -5f + -4 = 0

Reorder the terms:
-4 + -5f + f2 = 0

Solving
-4 + -5f + f2 = 0

Solving for variable 'f'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -5f + 4 + f2 = 0 + 4

Reorder the terms:
-4 + 4 + -5f + f2 = 0 + 4

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

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

The f term is -5f.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5f + 6.25 + f2 = 4 + 6.25

Reorder the terms:
6.25 + -5f + f2 = 4 + 6.25

Combine like terms: 4 + 6.25 = 10.25
6.25 + -5f + f2 = 10.25

Factor a perfect square on the left side:
(f + -2.5)(f + -2.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(f + -2.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

f + -2.5 = 3.201562119 Simplifying f + -2.5 = 3.201562119 Reorder the terms: -2.5 + f = 3.201562119 Solving -2.5 + f = 3.201562119 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + f = 3.201562119 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + f = 3.201562119 + 2.5 f = 3.201562119 + 2.5 Combine like terms: 3.201562119 + 2.5 = 5.701562119 f = 5.701562119 Simplifying f = 5.701562119

Subproblem 2

f + -2.5 = -3.201562119 Simplifying f + -2.5 = -3.201562119 Reorder the terms: -2.5 + f = -3.201562119 Solving -2.5 + f = -3.201562119 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + f = -3.201562119 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + f = -3.201562119 + 2.5 f = -3.201562119 + 2.5 Combine like terms: -3.201562119 + 2.5 = -0.701562119 f = -0.701562119 Simplifying f = -0.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. f = {5.701562119, -0.701562119}

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