-4f^2-5f+8=0

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Solution for -4f^2-5f+8=0 equation:


Simplifying
-4f2 + -5f + 8 = 0

Reorder the terms:
8 + -5f + -4f2 = 0

Solving
8 + -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'.
-2 + 1.25f + f2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 1.25f + 2 + f2 = 0 + 2

Reorder the terms:
-2 + 2 + 1.25f + f2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 1.25f + f2 = 0 + 2
1.25f + f2 = 0 + 2

Combine like terms: 0 + 2 = 2
1.25f + f2 = 2

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 = 2 + 0.390625

Reorder the terms:
0.390625 + 1.25f + f2 = 2 + 0.390625

Combine like terms: 2 + 0.390625 = 2.390625
0.390625 + 1.25f + f2 = 2.390625

Factor a perfect square on the left side:
(f + 0.625)(f + 0.625) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(f + 0.625) equal to 1.54616461 and -1.54616461.

Subproblem 1

f + 0.625 = 1.54616461 Simplifying f + 0.625 = 1.54616461 Reorder the terms: 0.625 + f = 1.54616461 Solving 0.625 + f = 1.54616461 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 = 1.54616461 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + f = 1.54616461 + -0.625 f = 1.54616461 + -0.625 Combine like terms: 1.54616461 + -0.625 = 0.92116461 f = 0.92116461 Simplifying f = 0.92116461

Subproblem 2

f + 0.625 = -1.54616461 Simplifying f + 0.625 = -1.54616461 Reorder the terms: 0.625 + f = -1.54616461 Solving 0.625 + f = -1.54616461 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 = -1.54616461 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + f = -1.54616461 + -0.625 f = -1.54616461 + -0.625 Combine like terms: -1.54616461 + -0.625 = -2.17116461 f = -2.17116461 Simplifying f = -2.17116461

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.92116461, -2.17116461}

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