(6x^2+3x)+(x^2-4x-3)=0

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Solution for (6x^2+3x)+(x^2-4x-3)=0 equation:


Simplifying
(6x2 + 3x) + (x2 + -4x + -3) = 0

Reorder the terms:
(3x + 6x2) + (x2 + -4x + -3) = 0

Remove parenthesis around (3x + 6x2)
3x + 6x2 + (x2 + -4x + -3) = 0

Reorder the terms:
3x + 6x2 + (-3 + -4x + x2) = 0

Remove parenthesis around (-3 + -4x + x2)
3x + 6x2 + -3 + -4x + x2 = 0

Reorder the terms:
-3 + 3x + -4x + 6x2 + x2 = 0

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

Combine like terms: 6x2 + x2 = 7x2
-3 + -1x + 7x2 = 0

Solving
-3 + -1x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-0.4285714286 + -0.1428571429x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + -0.1428571429x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + -0.1428571429x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + -0.1428571429x + x2 = 0 + 0.4285714286
-0.1428571429x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
-0.1428571429x + x2 = 0.4285714286

The x term is -0.1428571429x.  Take half its coefficient (-0.07142857145).
Square it (0.005102040819) and add it to both sides.

Add '0.005102040819' to each side of the equation.
-0.1428571429x + 0.005102040819 + x2 = 0.4285714286 + 0.005102040819

Reorder the terms:
0.005102040819 + -0.1428571429x + x2 = 0.4285714286 + 0.005102040819

Combine like terms: 0.4285714286 + 0.005102040819 = 0.433673469419
0.005102040819 + -0.1428571429x + x2 = 0.433673469419

Factor a perfect square on the left side:
(x + -0.07142857145)(x + -0.07142857145) = 0.433673469419

Calculate the square root of the right side: 0.65853889

Break this problem into two subproblems by setting 
(x + -0.07142857145) equal to 0.65853889 and -0.65853889.

Subproblem 1

x + -0.07142857145 = 0.65853889 Simplifying x + -0.07142857145 = 0.65853889 Reorder the terms: -0.07142857145 + x = 0.65853889 Solving -0.07142857145 + x = 0.65853889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = 0.65853889 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = 0.65853889 + 0.07142857145 x = 0.65853889 + 0.07142857145 Combine like terms: 0.65853889 + 0.07142857145 = 0.72996746145 x = 0.72996746145 Simplifying x = 0.72996746145

Subproblem 2

x + -0.07142857145 = -0.65853889 Simplifying x + -0.07142857145 = -0.65853889 Reorder the terms: -0.07142857145 + x = -0.65853889 Solving -0.07142857145 + x = -0.65853889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.07142857145' to each side of the equation. -0.07142857145 + 0.07142857145 + x = -0.65853889 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = -0.65853889 + 0.07142857145 x = -0.65853889 + 0.07142857145 Combine like terms: -0.65853889 + 0.07142857145 = -0.58711031855 x = -0.58711031855 Simplifying x = -0.58711031855

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.72996746145, -0.58711031855}

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