-4f(4f-5)=-19

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Solution for -4f(4f-5)=-19 equation:


Simplifying
-4f(4f + -5) = -19

Reorder the terms:
-4f(-5 + 4f) = -19
(-5 * -4f + 4f * -4f) = -19
(20f + -16f2) = -19

Solving
20f + -16f2 = -19

Solving for variable 'f'.

Reorder the terms:
19 + 20f + -16f2 = -19 + 19

Combine like terms: -19 + 19 = 0
19 + 20f + -16f2 = 0

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-1.1875 + -1.25f + f2 = 0

Move the constant term to the right:

Add '1.1875' to each side of the equation.
-1.1875 + -1.25f + 1.1875 + f2 = 0 + 1.1875

Reorder the terms:
-1.1875 + 1.1875 + -1.25f + f2 = 0 + 1.1875

Combine like terms: -1.1875 + 1.1875 = 0.0000
0.0000 + -1.25f + f2 = 0 + 1.1875
-1.25f + f2 = 0 + 1.1875

Combine like terms: 0 + 1.1875 = 1.1875
-1.25f + f2 = 1.1875

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 = 1.1875 + 0.390625

Reorder the terms:
0.390625 + -1.25f + f2 = 1.1875 + 0.390625

Combine like terms: 1.1875 + 0.390625 = 1.578125
0.390625 + -1.25f + f2 = 1.578125

Factor a perfect square on the left side:
(f + -0.625)(f + -0.625) = 1.578125

Calculate the square root of the right side: 1.256234453

Break this problem into two subproblems by setting 
(f + -0.625) equal to 1.256234453 and -1.256234453.

Subproblem 1

f + -0.625 = 1.256234453 Simplifying f + -0.625 = 1.256234453 Reorder the terms: -0.625 + f = 1.256234453 Solving -0.625 + f = 1.256234453 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 = 1.256234453 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + f = 1.256234453 + 0.625 f = 1.256234453 + 0.625 Combine like terms: 1.256234453 + 0.625 = 1.881234453 f = 1.881234453 Simplifying f = 1.881234453

Subproblem 2

f + -0.625 = -1.256234453 Simplifying f + -0.625 = -1.256234453 Reorder the terms: -0.625 + f = -1.256234453 Solving -0.625 + f = -1.256234453 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 = -1.256234453 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + f = -1.256234453 + 0.625 f = -1.256234453 + 0.625 Combine like terms: -1.256234453 + 0.625 = -0.631234453 f = -0.631234453 Simplifying f = -0.631234453

Solution

The solution to the problem is based on the solutions from the subproblems. f = {1.881234453, -0.631234453}

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