7x^2-x-6-6=0

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Solution for 7x^2-x-6-6=0 equation:


Simplifying
7x2 + -1x + -6 + -6 = 0

Reorder the terms:
-6 + -6 + -1x + 7x2 = 0

Combine like terms: -6 + -6 = -12
-12 + -1x + 7x2 = 0

Solving
-12 + -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'.
-1.714285714 + -0.1428571429x + x2 = 0

Move the constant term to the right:

Add '1.714285714' to each side of the equation.
-1.714285714 + -0.1428571429x + 1.714285714 + x2 = 0 + 1.714285714

Reorder the terms:
-1.714285714 + 1.714285714 + -0.1428571429x + x2 = 0 + 1.714285714

Combine like terms: -1.714285714 + 1.714285714 = 0.000000000
0.000000000 + -0.1428571429x + x2 = 0 + 1.714285714
-0.1428571429x + x2 = 0 + 1.714285714

Combine like terms: 0 + 1.714285714 = 1.714285714
-0.1428571429x + x2 = 1.714285714

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 = 1.714285714 + 0.005102040819

Reorder the terms:
0.005102040819 + -0.1428571429x + x2 = 1.714285714 + 0.005102040819

Combine like terms: 1.714285714 + 0.005102040819 = 1.719387754819
0.005102040819 + -0.1428571429x + x2 = 1.719387754819

Factor a perfect square on the left side:
(x + -0.07142857145)(x + -0.07142857145) = 1.719387754819

Calculate the square root of the right side: 1.311254268

Break this problem into two subproblems by setting 
(x + -0.07142857145) equal to 1.311254268 and -1.311254268.

Subproblem 1

x + -0.07142857145 = 1.311254268 Simplifying x + -0.07142857145 = 1.311254268 Reorder the terms: -0.07142857145 + x = 1.311254268 Solving -0.07142857145 + x = 1.311254268 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 = 1.311254268 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = 1.311254268 + 0.07142857145 x = 1.311254268 + 0.07142857145 Combine like terms: 1.311254268 + 0.07142857145 = 1.38268283945 x = 1.38268283945 Simplifying x = 1.38268283945

Subproblem 2

x + -0.07142857145 = -1.311254268 Simplifying x + -0.07142857145 = -1.311254268 Reorder the terms: -0.07142857145 + x = -1.311254268 Solving -0.07142857145 + x = -1.311254268 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 = -1.311254268 + 0.07142857145 Combine like terms: -0.07142857145 + 0.07142857145 = 0.00000000000 0.00000000000 + x = -1.311254268 + 0.07142857145 x = -1.311254268 + 0.07142857145 Combine like terms: -1.311254268 + 0.07142857145 = -1.23982569655 x = -1.23982569655 Simplifying x = -1.23982569655

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.38268283945, -1.23982569655}

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