12k^2-9k-2=3

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Solution for 12k^2-9k-2=3 equation:


Simplifying
12k2 + -9k + -2 = 3

Reorder the terms:
-2 + -9k + 12k2 = 3

Solving
-2 + -9k + 12k2 = 3

Solving for variable 'k'.

Reorder the terms:
-2 + -3 + -9k + 12k2 = 3 + -3

Combine like terms: -2 + -3 = -5
-5 + -9k + 12k2 = 3 + -3

Combine like terms: 3 + -3 = 0
-5 + -9k + 12k2 = 0

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

Divide each side by '12'.
-0.4166666667 + -0.75k + k2 = 0

Move the constant term to the right:

Add '0.4166666667' to each side of the equation.
-0.4166666667 + -0.75k + 0.4166666667 + k2 = 0 + 0.4166666667

Reorder the terms:
-0.4166666667 + 0.4166666667 + -0.75k + k2 = 0 + 0.4166666667

Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000
0.0000000000 + -0.75k + k2 = 0 + 0.4166666667
-0.75k + k2 = 0 + 0.4166666667

Combine like terms: 0 + 0.4166666667 = 0.4166666667
-0.75k + k2 = 0.4166666667

The k term is -0.75k.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75k + 0.140625 + k2 = 0.4166666667 + 0.140625

Reorder the terms:
0.140625 + -0.75k + k2 = 0.4166666667 + 0.140625

Combine like terms: 0.4166666667 + 0.140625 = 0.5572916667
0.140625 + -0.75k + k2 = 0.5572916667

Factor a perfect square on the left side:
(k + -0.375)(k + -0.375) = 0.5572916667

Calculate the square root of the right side: 0.746519703

Break this problem into two subproblems by setting 
(k + -0.375) equal to 0.746519703 and -0.746519703.

Subproblem 1

k + -0.375 = 0.746519703 Simplifying k + -0.375 = 0.746519703 Reorder the terms: -0.375 + k = 0.746519703 Solving -0.375 + k = 0.746519703 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + k = 0.746519703 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + k = 0.746519703 + 0.375 k = 0.746519703 + 0.375 Combine like terms: 0.746519703 + 0.375 = 1.121519703 k = 1.121519703 Simplifying k = 1.121519703

Subproblem 2

k + -0.375 = -0.746519703 Simplifying k + -0.375 = -0.746519703 Reorder the terms: -0.375 + k = -0.746519703 Solving -0.375 + k = -0.746519703 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + k = -0.746519703 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + k = -0.746519703 + 0.375 k = -0.746519703 + 0.375 Combine like terms: -0.746519703 + 0.375 = -0.371519703 k = -0.371519703 Simplifying k = -0.371519703

Solution

The solution to the problem is based on the solutions from the subproblems. k = {1.121519703, -0.371519703}

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