7x^2-10x-111=0

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Solution for 7x^2-10x-111=0 equation:


Simplifying
7x2 + -10x + -111 = 0

Reorder the terms:
-111 + -10x + 7x2 = 0

Solving
-111 + -10x + 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'.
-15.85714286 + -1.428571429x + x2 = 0

Move the constant term to the right:

Add '15.85714286' to each side of the equation.
-15.85714286 + -1.428571429x + 15.85714286 + x2 = 0 + 15.85714286

Reorder the terms:
-15.85714286 + 15.85714286 + -1.428571429x + x2 = 0 + 15.85714286

Combine like terms: -15.85714286 + 15.85714286 = 0.00000000
0.00000000 + -1.428571429x + x2 = 0 + 15.85714286
-1.428571429x + x2 = 0 + 15.85714286

Combine like terms: 0 + 15.85714286 = 15.85714286
-1.428571429x + x2 = 15.85714286

The x term is -1.428571429x.  Take half its coefficient (-0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
-1.428571429x + 0.5102040819 + x2 = 15.85714286 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429x + x2 = 15.85714286 + 0.5102040819

Combine like terms: 15.85714286 + 0.5102040819 = 16.3673469419
0.5102040819 + -1.428571429x + x2 = 16.3673469419

Factor a perfect square on the left side:
(x + -0.7142857145)(x + -0.7142857145) = 16.3673469419

Calculate the square root of the right side: 4.045657789

Break this problem into two subproblems by setting 
(x + -0.7142857145) equal to 4.045657789 and -4.045657789.

Subproblem 1

x + -0.7142857145 = 4.045657789 Simplifying x + -0.7142857145 = 4.045657789 Reorder the terms: -0.7142857145 + x = 4.045657789 Solving -0.7142857145 + x = 4.045657789 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + x = 4.045657789 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = 4.045657789 + 0.7142857145 x = 4.045657789 + 0.7142857145 Combine like terms: 4.045657789 + 0.7142857145 = 4.7599435035 x = 4.7599435035 Simplifying x = 4.7599435035

Subproblem 2

x + -0.7142857145 = -4.045657789 Simplifying x + -0.7142857145 = -4.045657789 Reorder the terms: -0.7142857145 + x = -4.045657789 Solving -0.7142857145 + x = -4.045657789 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + x = -4.045657789 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = -4.045657789 + 0.7142857145 x = -4.045657789 + 0.7142857145 Combine like terms: -4.045657789 + 0.7142857145 = -3.3313720745 x = -3.3313720745 Simplifying x = -3.3313720745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.7599435035, -3.3313720745}

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