7x^2-10x-12=0

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Solution for 7x^2-10x-12=0 equation:


Simplifying
7x2 + -10x + -12 = 0

Reorder the terms:
-12 + -10x + 7x2 = 0

Solving
-12 + -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'.
-1.714285714 + -1.428571429x + x2 = 0

Move the constant term to the right:

Add '1.714285714' to each side of the equation.
-1.714285714 + -1.428571429x + 1.714285714 + x2 = 0 + 1.714285714

Reorder the terms:
-1.714285714 + 1.714285714 + -1.428571429x + x2 = 0 + 1.714285714

Combine like terms: -1.714285714 + 1.714285714 = 0.000000000
0.000000000 + -1.428571429x + x2 = 0 + 1.714285714
-1.428571429x + x2 = 0 + 1.714285714

Combine like terms: 0 + 1.714285714 = 1.714285714
-1.428571429x + x2 = 1.714285714

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 = 1.714285714 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429x + x2 = 1.714285714 + 0.5102040819

Combine like terms: 1.714285714 + 0.5102040819 = 2.2244897959
0.5102040819 + -1.428571429x + x2 = 2.2244897959

Factor a perfect square on the left side:
(x + -0.7142857145)(x + -0.7142857145) = 2.2244897959

Calculate the square root of the right side: 1.491472358

Break this problem into two subproblems by setting 
(x + -0.7142857145) equal to 1.491472358 and -1.491472358.

Subproblem 1

x + -0.7142857145 = 1.491472358 Simplifying x + -0.7142857145 = 1.491472358 Reorder the terms: -0.7142857145 + x = 1.491472358 Solving -0.7142857145 + x = 1.491472358 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 = 1.491472358 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = 1.491472358 + 0.7142857145 x = 1.491472358 + 0.7142857145 Combine like terms: 1.491472358 + 0.7142857145 = 2.2057580725 x = 2.2057580725 Simplifying x = 2.2057580725

Subproblem 2

x + -0.7142857145 = -1.491472358 Simplifying x + -0.7142857145 = -1.491472358 Reorder the terms: -0.7142857145 + x = -1.491472358 Solving -0.7142857145 + x = -1.491472358 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 = -1.491472358 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = -1.491472358 + 0.7142857145 x = -1.491472358 + 0.7142857145 Combine like terms: -1.491472358 + 0.7142857145 = -0.7771866435 x = -0.7771866435 Simplifying x = -0.7771866435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2057580725, -0.7771866435}

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