7x^2-3x-6=0

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Solution for 7x^2-3x-6=0 equation:


Simplifying
7x2 + -3x + -6 = 0

Reorder the terms:
-6 + -3x + 7x2 = 0

Solving
-6 + -3x + 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'.
-0.8571428571 + -0.4285714286x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + -0.4285714286x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + -0.4285714286x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + -0.4285714286x + x2 = 0 + 0.8571428571
-0.4285714286x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
-0.4285714286x + x2 = 0.8571428571

The x term is -0.4285714286x.  Take half its coefficient (-0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
-0.4285714286x + 0.04591836735 + x2 = 0.8571428571 + 0.04591836735

Reorder the terms:
0.04591836735 + -0.4285714286x + x2 = 0.8571428571 + 0.04591836735

Combine like terms: 0.8571428571 + 0.04591836735 = 0.90306122445
0.04591836735 + -0.4285714286x + x2 = 0.90306122445

Factor a perfect square on the left side:
(x + -0.2142857143)(x + -0.2142857143) = 0.90306122445

Calculate the square root of the right side: 0.950295335

Break this problem into two subproblems by setting 
(x + -0.2142857143) equal to 0.950295335 and -0.950295335.

Subproblem 1

x + -0.2142857143 = 0.950295335 Simplifying x + -0.2142857143 = 0.950295335 Reorder the terms: -0.2142857143 + x = 0.950295335 Solving -0.2142857143 + x = 0.950295335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x = 0.950295335 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x = 0.950295335 + 0.2142857143 x = 0.950295335 + 0.2142857143 Combine like terms: 0.950295335 + 0.2142857143 = 1.1645810493 x = 1.1645810493 Simplifying x = 1.1645810493

Subproblem 2

x + -0.2142857143 = -0.950295335 Simplifying x + -0.2142857143 = -0.950295335 Reorder the terms: -0.2142857143 + x = -0.950295335 Solving -0.2142857143 + x = -0.950295335 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x = -0.950295335 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x = -0.950295335 + 0.2142857143 x = -0.950295335 + 0.2142857143 Combine like terms: -0.950295335 + 0.2142857143 = -0.7360096207 x = -0.7360096207 Simplifying x = -0.7360096207

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1645810493, -0.7360096207}

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