7x^2-5x-6=1

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Solution for 7x^2-5x-6=1 equation:


Simplifying
7x2 + -5x + -6 = 1

Reorder the terms:
-6 + -5x + 7x2 = 1

Solving
-6 + -5x + 7x2 = 1

Solving for variable 'x'.

Reorder the terms:
-6 + -1 + -5x + 7x2 = 1 + -1

Combine like terms: -6 + -1 = -7
-7 + -5x + 7x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-7 + -5x + 7x2 = 0

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

Divide each side by '7'.
-1 + -0.7142857143x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.7142857143x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.7142857143x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.7142857143x + x2 = 0 + 1
-0.7142857143x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.7142857143x + x2 = 1

The x term is -0.7142857143x.  Take half its coefficient (-0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
-0.7142857143x + 0.1275510204 + x2 = 1 + 0.1275510204

Reorder the terms:
0.1275510204 + -0.7142857143x + x2 = 1 + 0.1275510204

Combine like terms: 1 + 0.1275510204 = 1.1275510204
0.1275510204 + -0.7142857143x + x2 = 1.1275510204

Factor a perfect square on the left side:
(x + -0.3571428572)(x + -0.3571428572) = 1.1275510204

Calculate the square root of the right side: 1.061862053

Break this problem into two subproblems by setting 
(x + -0.3571428572) equal to 1.061862053 and -1.061862053.

Subproblem 1

x + -0.3571428572 = 1.061862053 Simplifying x + -0.3571428572 = 1.061862053 Reorder the terms: -0.3571428572 + x = 1.061862053 Solving -0.3571428572 + x = 1.061862053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3571428572' to each side of the equation. -0.3571428572 + 0.3571428572 + x = 1.061862053 + 0.3571428572 Combine like terms: -0.3571428572 + 0.3571428572 = 0.0000000000 0.0000000000 + x = 1.061862053 + 0.3571428572 x = 1.061862053 + 0.3571428572 Combine like terms: 1.061862053 + 0.3571428572 = 1.4190049102 x = 1.4190049102 Simplifying x = 1.4190049102

Subproblem 2

x + -0.3571428572 = -1.061862053 Simplifying x + -0.3571428572 = -1.061862053 Reorder the terms: -0.3571428572 + x = -1.061862053 Solving -0.3571428572 + x = -1.061862053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3571428572' to each side of the equation. -0.3571428572 + 0.3571428572 + x = -1.061862053 + 0.3571428572 Combine like terms: -0.3571428572 + 0.3571428572 = 0.0000000000 0.0000000000 + x = -1.061862053 + 0.3571428572 x = -1.061862053 + 0.3571428572 Combine like terms: -1.061862053 + 0.3571428572 = -0.7047191958 x = -0.7047191958 Simplifying x = -0.7047191958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4190049102, -0.7047191958}

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