7x^2-x^2-7x-1=0

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Solution for 7x^2-x^2-7x-1=0 equation:


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

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

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

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

Solving for variable 'x'.

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

Divide each side by '6'.
-0.1666666667 + -1.166666667x + x2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + -1.166666667x + 0.1666666667 + x2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + -1.166666667x + x2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + -1.166666667x + x2 = 0 + 0.1666666667
-1.166666667x + x2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
-1.166666667x + x2 = 0.1666666667

The x term is -1.166666667x.  Take half its coefficient (-0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
-1.166666667x + 0.3402777780 + x2 = 0.1666666667 + 0.3402777780

Reorder the terms:
0.3402777780 + -1.166666667x + x2 = 0.1666666667 + 0.3402777780

Combine like terms: 0.1666666667 + 0.3402777780 = 0.5069444447
0.3402777780 + -1.166666667x + x2 = 0.5069444447

Factor a perfect square on the left side:
(x + -0.5833333335)(x + -0.5833333335) = 0.5069444447

Calculate the square root of the right side: 0.712000312

Break this problem into two subproblems by setting 
(x + -0.5833333335) equal to 0.712000312 and -0.712000312.

Subproblem 1

x + -0.5833333335 = 0.712000312 Simplifying x + -0.5833333335 = 0.712000312 Reorder the terms: -0.5833333335 + x = 0.712000312 Solving -0.5833333335 + x = 0.712000312 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + x = 0.712000312 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + x = 0.712000312 + 0.5833333335 x = 0.712000312 + 0.5833333335 Combine like terms: 0.712000312 + 0.5833333335 = 1.2953336455 x = 1.2953336455 Simplifying x = 1.2953336455

Subproblem 2

x + -0.5833333335 = -0.712000312 Simplifying x + -0.5833333335 = -0.712000312 Reorder the terms: -0.5833333335 + x = -0.712000312 Solving -0.5833333335 + x = -0.712000312 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + x = -0.712000312 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + x = -0.712000312 + 0.5833333335 x = -0.712000312 + 0.5833333335 Combine like terms: -0.712000312 + 0.5833333335 = -0.1286669785 x = -0.1286669785 Simplifying x = -0.1286669785

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2953336455, -0.1286669785}

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