3x^2-7x-6=x

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Solution for 3x^2-7x-6=x equation:


Simplifying
3x2 + -7x + -6 = x

Reorder the terms:
-6 + -7x + 3x2 = x

Solving
-6 + -7x + 3x2 = x

Solving for variable 'x'.

Reorder the terms:
-6 + -7x + -1x + 3x2 = x + -1x

Combine like terms: -7x + -1x = -8x
-6 + -8x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
-6 + -8x + 3x2 = 0

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

Divide each side by '3'.
-2 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -2.666666667x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -2.666666667x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -2.666666667x + x2 = 0 + 2
-2.666666667x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-2.666666667x + x2 = 2

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 2 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 2 + 1.777777780

Combine like terms: 2 + 1.777777780 = 3.77777778
1.777777780 + -2.666666667x + x2 = 3.77777778

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 3.77777778

Calculate the square root of the right side: 1.943650632

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 1.943650632 and -1.943650632.

Subproblem 1

x + -1.333333334 = 1.943650632 Simplifying x + -1.333333334 = 1.943650632 Reorder the terms: -1.333333334 + x = 1.943650632 Solving -1.333333334 + x = 1.943650632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 1.943650632 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 1.943650632 + 1.333333334 x = 1.943650632 + 1.333333334 Combine like terms: 1.943650632 + 1.333333334 = 3.276983966 x = 3.276983966 Simplifying x = 3.276983966

Subproblem 2

x + -1.333333334 = -1.943650632 Simplifying x + -1.333333334 = -1.943650632 Reorder the terms: -1.333333334 + x = -1.943650632 Solving -1.333333334 + x = -1.943650632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -1.943650632 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -1.943650632 + 1.333333334 x = -1.943650632 + 1.333333334 Combine like terms: -1.943650632 + 1.333333334 = -0.610317298 x = -0.610317298 Simplifying x = -0.610317298

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.276983966, -0.610317298}

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