4f^2+5f-4=0

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


Simplifying
4f2 + 5f + -4 = 0

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

Solving
-4 + 5f + 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'.
-1 + 1.25f + f2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 1.25f + 1 + f2 = 0 + 1

Reorder the terms:
-1 + 1 + 1.25f + f2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 1.25f + f2 = 0 + 1
1.25f + f2 = 0 + 1

Combine like terms: 0 + 1 = 1
1.25f + f2 = 1

The f term is 1.25f.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25f + 0.390625 + f2 = 1 + 0.390625

Reorder the terms:
0.390625 + 1.25f + f2 = 1 + 0.390625

Combine like terms: 1 + 0.390625 = 1.390625
0.390625 + 1.25f + f2 = 1.390625

Factor a perfect square on the left side:
(f + 0.625)(f + 0.625) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(f + 0.625) equal to 1.179247642 and -1.179247642.

Subproblem 1

f + 0.625 = 1.179247642 Simplifying f + 0.625 = 1.179247642 Reorder the terms: 0.625 + f = 1.179247642 Solving 0.625 + f = 1.179247642 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + f = 1.179247642 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + f = 1.179247642 + -0.625 f = 1.179247642 + -0.625 Combine like terms: 1.179247642 + -0.625 = 0.554247642 f = 0.554247642 Simplifying f = 0.554247642

Subproblem 2

f + 0.625 = -1.179247642 Simplifying f + 0.625 = -1.179247642 Reorder the terms: 0.625 + f = -1.179247642 Solving 0.625 + f = -1.179247642 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + f = -1.179247642 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + f = -1.179247642 + -0.625 f = -1.179247642 + -0.625 Combine like terms: -1.179247642 + -0.625 = -1.804247642 f = -1.804247642 Simplifying f = -1.804247642

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.554247642, -1.804247642}

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