5k(k-2)-8k=34

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Solution for 5k(k-2)-8k=34 equation:


Simplifying
5k(k + -2) + -8k = 34

Reorder the terms:
5k(-2 + k) + -8k = 34
(-2 * 5k + k * 5k) + -8k = 34
(-10k + 5k2) + -8k = 34

Reorder the terms:
-10k + -8k + 5k2 = 34

Combine like terms: -10k + -8k = -18k
-18k + 5k2 = 34

Solving
-18k + 5k2 = 34

Solving for variable 'k'.

Reorder the terms:
-34 + -18k + 5k2 = 34 + -34

Combine like terms: 34 + -34 = 0
-34 + -18k + 5k2 = 0

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

Divide each side by '5'.
-6.8 + -3.6k + k2 = 0

Move the constant term to the right:

Add '6.8' to each side of the equation.
-6.8 + -3.6k + 6.8 + k2 = 0 + 6.8

Reorder the terms:
-6.8 + 6.8 + -3.6k + k2 = 0 + 6.8

Combine like terms: -6.8 + 6.8 = 0.0
0.0 + -3.6k + k2 = 0 + 6.8
-3.6k + k2 = 0 + 6.8

Combine like terms: 0 + 6.8 = 6.8
-3.6k + k2 = 6.8

The k term is -3.6k.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6k + 3.24 + k2 = 6.8 + 3.24

Reorder the terms:
3.24 + -3.6k + k2 = 6.8 + 3.24

Combine like terms: 6.8 + 3.24 = 10.04
3.24 + -3.6k + k2 = 10.04

Factor a perfect square on the left side:
(k + -1.8)(k + -1.8) = 10.04

Calculate the square root of the right side: 3.168595904

Break this problem into two subproblems by setting 
(k + -1.8) equal to 3.168595904 and -3.168595904.

Subproblem 1

k + -1.8 = 3.168595904 Simplifying k + -1.8 = 3.168595904 Reorder the terms: -1.8 + k = 3.168595904 Solving -1.8 + k = 3.168595904 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + k = 3.168595904 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + k = 3.168595904 + 1.8 k = 3.168595904 + 1.8 Combine like terms: 3.168595904 + 1.8 = 4.968595904 k = 4.968595904 Simplifying k = 4.968595904

Subproblem 2

k + -1.8 = -3.168595904 Simplifying k + -1.8 = -3.168595904 Reorder the terms: -1.8 + k = -3.168595904 Solving -1.8 + k = -3.168595904 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + k = -3.168595904 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + k = -3.168595904 + 1.8 k = -3.168595904 + 1.8 Combine like terms: -3.168595904 + 1.8 = -1.368595904 k = -1.368595904 Simplifying k = -1.368595904

Solution

The solution to the problem is based on the solutions from the subproblems. k = {4.968595904, -1.368595904}

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