12x^2+17x-39=0

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Solution for 12x^2+17x-39=0 equation:


Simplifying
12x2 + 17x + -39 = 0

Reorder the terms:
-39 + 17x + 12x2 = 0

Solving
-39 + 17x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-3.25 + 1.416666667x + x2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + 1.416666667x + 3.25 + x2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + 1.416666667x + x2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + 1.416666667x + x2 = 0 + 3.25
1.416666667x + x2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
1.416666667x + x2 = 3.25

The x term is 1.416666667x.  Take half its coefficient (0.7083333335).
Square it (0.5017361113) and add it to both sides.

Add '0.5017361113' to each side of the equation.
1.416666667x + 0.5017361113 + x2 = 3.25 + 0.5017361113

Reorder the terms:
0.5017361113 + 1.416666667x + x2 = 3.25 + 0.5017361113

Combine like terms: 3.25 + 0.5017361113 = 3.7517361113
0.5017361113 + 1.416666667x + x2 = 3.7517361113

Factor a perfect square on the left side:
(x + 0.7083333335)(x + 0.7083333335) = 3.7517361113

Calculate the square root of the right side: 1.936939883

Break this problem into two subproblems by setting 
(x + 0.7083333335) equal to 1.936939883 and -1.936939883.

Subproblem 1

x + 0.7083333335 = 1.936939883 Simplifying x + 0.7083333335 = 1.936939883 Reorder the terms: 0.7083333335 + x = 1.936939883 Solving 0.7083333335 + x = 1.936939883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7083333335' to each side of the equation. 0.7083333335 + -0.7083333335 + x = 1.936939883 + -0.7083333335 Combine like terms: 0.7083333335 + -0.7083333335 = 0.0000000000 0.0000000000 + x = 1.936939883 + -0.7083333335 x = 1.936939883 + -0.7083333335 Combine like terms: 1.936939883 + -0.7083333335 = 1.2286065495 x = 1.2286065495 Simplifying x = 1.2286065495

Subproblem 2

x + 0.7083333335 = -1.936939883 Simplifying x + 0.7083333335 = -1.936939883 Reorder the terms: 0.7083333335 + x = -1.936939883 Solving 0.7083333335 + x = -1.936939883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7083333335' to each side of the equation. 0.7083333335 + -0.7083333335 + x = -1.936939883 + -0.7083333335 Combine like terms: 0.7083333335 + -0.7083333335 = 0.0000000000 0.0000000000 + x = -1.936939883 + -0.7083333335 x = -1.936939883 + -0.7083333335 Combine like terms: -1.936939883 + -0.7083333335 = -2.6452732165 x = -2.6452732165 Simplifying x = -2.6452732165

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2286065495, -2.6452732165}

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