5k^2-45k+8=0

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Solution for 5k^2-45k+8=0 equation:


Simplifying
5k2 + -45k + 8 = 0

Reorder the terms:
8 + -45k + 5k2 = 0

Solving
8 + -45k + 5k2 = 0

Solving for variable 'k'.

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

Divide each side by '5'.
1.6 + -9k + k2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -9k + -1.6 + k2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -9k + k2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -9k + k2 = 0 + -1.6
-9k + k2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-9k + k2 = -1.6

The k term is -9k.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9k + 20.25 + k2 = -1.6 + 20.25

Reorder the terms:
20.25 + -9k + k2 = -1.6 + 20.25

Combine like terms: -1.6 + 20.25 = 18.65
20.25 + -9k + k2 = 18.65

Factor a perfect square on the left side:
(k + -4.5)(k + -4.5) = 18.65

Calculate the square root of the right side: 4.318564576

Break this problem into two subproblems by setting 
(k + -4.5) equal to 4.318564576 and -4.318564576.

Subproblem 1

k + -4.5 = 4.318564576 Simplifying k + -4.5 = 4.318564576 Reorder the terms: -4.5 + k = 4.318564576 Solving -4.5 + k = 4.318564576 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + k = 4.318564576 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + k = 4.318564576 + 4.5 k = 4.318564576 + 4.5 Combine like terms: 4.318564576 + 4.5 = 8.818564576 k = 8.818564576 Simplifying k = 8.818564576

Subproblem 2

k + -4.5 = -4.318564576 Simplifying k + -4.5 = -4.318564576 Reorder the terms: -4.5 + k = -4.318564576 Solving -4.5 + k = -4.318564576 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + k = -4.318564576 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + k = -4.318564576 + 4.5 k = -4.318564576 + 4.5 Combine like terms: -4.318564576 + 4.5 = 0.181435424 k = 0.181435424 Simplifying k = 0.181435424

Solution

The solution to the problem is based on the solutions from the subproblems. k = {8.818564576, 0.181435424}

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