0.3k^2-0.6k=2.4

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Solution for 0.3k^2-0.6k=2.4 equation:


Simplifying
0.3k2 + -0.6k = 2.4

Reorder the terms:
-0.6k + 0.3k2 = 2.4

Solving
-0.6k + 0.3k2 = 2.4

Solving for variable 'k'.

Reorder the terms:
-2.4 + -0.6k + 0.3k2 = 2.4 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
-2.4 + -0.6k + 0.3k2 = 0.0

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

Divide each side by '0.3'.
-8 + -2k + k2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -2k + 8 + k2 = 0 + 8

Reorder the terms:
-8 + 8 + -2k + k2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -2k + k2 = 0 + 8
-2k + k2 = 0 + 8

Combine like terms: 0 + 8 = 8
-2k + k2 = 8

The k term is -2k.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2k + 1 + k2 = 8 + 1

Reorder the terms:
1 + -2k + k2 = 8 + 1

Combine like terms: 8 + 1 = 9
1 + -2k + k2 = 9

Factor a perfect square on the left side:
(k + -1)(k + -1) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(k + -1) equal to 3 and -3.

Subproblem 1

k + -1 = 3 Simplifying k + -1 = 3 Reorder the terms: -1 + k = 3 Solving -1 + k = 3 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + k = 3 + 1 Combine like terms: -1 + 1 = 0 0 + k = 3 + 1 k = 3 + 1 Combine like terms: 3 + 1 = 4 k = 4 Simplifying k = 4

Subproblem 2

k + -1 = -3 Simplifying k + -1 = -3 Reorder the terms: -1 + k = -3 Solving -1 + k = -3 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + k = -3 + 1 Combine like terms: -1 + 1 = 0 0 + k = -3 + 1 k = -3 + 1 Combine like terms: -3 + 1 = -2 k = -2 Simplifying k = -2

Solution

The solution to the problem is based on the solutions from the subproblems. k = {4, -2}

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