-8k(k-4)-(-5k-5)=-4k

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Solution for -8k(k-4)-(-5k-5)=-4k equation:


Simplifying
-8k(k + -4) + -1(-5k + -5) = -4k

Reorder the terms:
-8k(-4 + k) + -1(-5k + -5) = -4k
(-4 * -8k + k * -8k) + -1(-5k + -5) = -4k
(32k + -8k2) + -1(-5k + -5) = -4k

Reorder the terms:
32k + -8k2 + -1(-5 + -5k) = -4k
32k + -8k2 + (-5 * -1 + -5k * -1) = -4k
32k + -8k2 + (5 + 5k) = -4k

Reorder the terms:
5 + 32k + 5k + -8k2 = -4k

Combine like terms: 32k + 5k = 37k
5 + 37k + -8k2 = -4k

Solving
5 + 37k + -8k2 = -4k

Solving for variable 'k'.

Reorder the terms:
5 + 37k + 4k + -8k2 = -4k + 4k

Combine like terms: 37k + 4k = 41k
5 + 41k + -8k2 = -4k + 4k

Combine like terms: -4k + 4k = 0
5 + 41k + -8k2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-0.625 + -5.125k + k2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -5.125k + 0.625 + k2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -5.125k + k2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -5.125k + k2 = 0 + 0.625
-5.125k + k2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-5.125k + k2 = 0.625

The k term is -5.125k.  Take half its coefficient (-2.5625).
Square it (6.56640625) and add it to both sides.

Add '6.56640625' to each side of the equation.
-5.125k + 6.56640625 + k2 = 0.625 + 6.56640625

Reorder the terms:
6.56640625 + -5.125k + k2 = 0.625 + 6.56640625

Combine like terms: 0.625 + 6.56640625 = 7.19140625
6.56640625 + -5.125k + k2 = 7.19140625

Factor a perfect square on the left side:
(k + -2.5625)(k + -2.5625) = 7.19140625

Calculate the square root of the right side: 2.681679744

Break this problem into two subproblems by setting 
(k + -2.5625) equal to 2.681679744 and -2.681679744.

Subproblem 1

k + -2.5625 = 2.681679744 Simplifying k + -2.5625 = 2.681679744 Reorder the terms: -2.5625 + k = 2.681679744 Solving -2.5625 + k = 2.681679744 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '2.5625' to each side of the equation. -2.5625 + 2.5625 + k = 2.681679744 + 2.5625 Combine like terms: -2.5625 + 2.5625 = 0.0000 0.0000 + k = 2.681679744 + 2.5625 k = 2.681679744 + 2.5625 Combine like terms: 2.681679744 + 2.5625 = 5.244179744 k = 5.244179744 Simplifying k = 5.244179744

Subproblem 2

k + -2.5625 = -2.681679744 Simplifying k + -2.5625 = -2.681679744 Reorder the terms: -2.5625 + k = -2.681679744 Solving -2.5625 + k = -2.681679744 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '2.5625' to each side of the equation. -2.5625 + 2.5625 + k = -2.681679744 + 2.5625 Combine like terms: -2.5625 + 2.5625 = 0.0000 0.0000 + k = -2.681679744 + 2.5625 k = -2.681679744 + 2.5625 Combine like terms: -2.681679744 + 2.5625 = -0.119179744 k = -0.119179744 Simplifying k = -0.119179744

Solution

The solution to the problem is based on the solutions from the subproblems. k = {5.244179744, -0.119179744}

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