3x^2-17x-12=0

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Solution for 3x^2-17x-12=0 equation:


Simplifying
3x2 + -17x + -12 = 0

Reorder the terms:
-12 + -17x + 3x2 = 0

Solving
-12 + -17x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-4 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -5.666666667x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -5.666666667x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -5.666666667x + x2 = 0 + 4
-5.666666667x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-5.666666667x + x2 = 4

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = 4 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = 4 + 8.027777782

Combine like terms: 4 + 8.027777782 = 12.027777782
8.027777782 + -5.666666667x + x2 = 12.027777782

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 12.027777782

Calculate the square root of the right side: 3.468108675

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 3.468108675 and -3.468108675.

Subproblem 1

x + -2.833333334 = 3.468108675 Simplifying x + -2.833333334 = 3.468108675 Reorder the terms: -2.833333334 + x = 3.468108675 Solving -2.833333334 + x = 3.468108675 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 3.468108675 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 3.468108675 + 2.833333334 x = 3.468108675 + 2.833333334 Combine like terms: 3.468108675 + 2.833333334 = 6.301442009 x = 6.301442009 Simplifying x = 6.301442009

Subproblem 2

x + -2.833333334 = -3.468108675 Simplifying x + -2.833333334 = -3.468108675 Reorder the terms: -2.833333334 + x = -3.468108675 Solving -2.833333334 + x = -3.468108675 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -3.468108675 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -3.468108675 + 2.833333334 x = -3.468108675 + 2.833333334 Combine like terms: -3.468108675 + 2.833333334 = -0.634775341 x = -0.634775341 Simplifying x = -0.634775341

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.301442009, -0.634775341}

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