(3x^2+2x-6)+(x^2-4x)=x

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Solution for (3x^2+2x-6)+(x^2-4x)=x equation:


Simplifying
(3x2 + 2x + -6) + (x2 + -4x) = x

Reorder the terms:
(-6 + 2x + 3x2) + (x2 + -4x) = x

Remove parenthesis around (-6 + 2x + 3x2)
-6 + 2x + 3x2 + (x2 + -4x) = x

Reorder the terms:
-6 + 2x + 3x2 + (-4x + x2) = x

Remove parenthesis around (-4x + x2)
-6 + 2x + 3x2 + -4x + x2 = x

Reorder the terms:
-6 + 2x + -4x + 3x2 + x2 = x

Combine like terms: 2x + -4x = -2x
-6 + -2x + 3x2 + x2 = x

Combine like terms: 3x2 + x2 = 4x2
-6 + -2x + 4x2 = x

Solving
-6 + -2x + 4x2 = x

Solving for variable 'x'.

Reorder the terms:
-6 + -2x + -1x + 4x2 = x + -1x

Combine like terms: -2x + -1x = -3x
-6 + -3x + 4x2 = x + -1x

Combine like terms: x + -1x = 0
-6 + -3x + 4x2 = 0

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

Divide each side by '4'.
-1.5 + -0.75x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.75x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.75x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.75x + x2 = 0 + 1.5
-0.75x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.75x + x2 = 1.5

The x term is -0.75x.  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.
-0.75x + 0.140625 + x2 = 1.5 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 1.5 + 0.140625

Combine like terms: 1.5 + 0.140625 = 1.640625
0.140625 + -0.75x + x2 = 1.640625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 1.640625

Calculate the square root of the right side: 1.280868846

Break this problem into two subproblems by setting 
(x + -0.375) equal to 1.280868846 and -1.280868846.

Subproblem 1

x + -0.375 = 1.280868846 Simplifying x + -0.375 = 1.280868846 Reorder the terms: -0.375 + x = 1.280868846 Solving -0.375 + x = 1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 1.280868846 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 1.280868846 + 0.375 x = 1.280868846 + 0.375 Combine like terms: 1.280868846 + 0.375 = 1.655868846 x = 1.655868846 Simplifying x = 1.655868846

Subproblem 2

x + -0.375 = -1.280868846 Simplifying x + -0.375 = -1.280868846 Reorder the terms: -0.375 + x = -1.280868846 Solving -0.375 + x = -1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -1.280868846 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -1.280868846 + 0.375 x = -1.280868846 + 0.375 Combine like terms: -1.280868846 + 0.375 = -0.905868846 x = -0.905868846 Simplifying x = -0.905868846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.655868846, -0.905868846}

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