k^2-5=8k

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Solution for k^2-5=8k equation:


Simplifying
k2 + -5 = 8k

Reorder the terms:
-5 + k2 = 8k

Solving
-5 + k2 = 8k

Solving for variable 'k'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -8k + 5 + k2 = 0 + 5

Reorder the terms:
-5 + 5 + -8k + k2 = 0 + 5

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

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

The k term is -8k.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8k + 16 + k2 = 5 + 16

Reorder the terms:
16 + -8k + k2 = 5 + 16

Combine like terms: 5 + 16 = 21
16 + -8k + k2 = 21

Factor a perfect square on the left side:
(k + -4)(k + -4) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(k + -4) equal to 4.582575695 and -4.582575695.

Subproblem 1

k + -4 = 4.582575695 Simplifying k + -4 = 4.582575695 Reorder the terms: -4 + k = 4.582575695 Solving -4 + k = 4.582575695 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + k = 4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + k = 4.582575695 + 4 k = 4.582575695 + 4 Combine like terms: 4.582575695 + 4 = 8.582575695 k = 8.582575695 Simplifying k = 8.582575695

Subproblem 2

k + -4 = -4.582575695 Simplifying k + -4 = -4.582575695 Reorder the terms: -4 + k = -4.582575695 Solving -4 + k = -4.582575695 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + k = -4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + k = -4.582575695 + 4 k = -4.582575695 + 4 Combine like terms: -4.582575695 + 4 = -0.582575695 k = -0.582575695 Simplifying k = -0.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. k = {8.582575695, -0.582575695}

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