6x^2+7x-120=0

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Solution for 6x^2+7x-120=0 equation:


Simplifying
6x2 + 7x + -120 = 0

Reorder the terms:
-120 + 7x + 6x2 = 0

Solving
-120 + 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'.
-20 + 1.166666667x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 1.166666667x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + 1.166666667x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 1.166666667x + x2 = 0 + 20
1.166666667x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
1.166666667x + x2 = 20

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 = 20 + 0.3402777780

Reorder the terms:
0.3402777780 + 1.166666667x + x2 = 20 + 0.3402777780

Combine like terms: 20 + 0.3402777780 = 20.340277778
0.3402777780 + 1.166666667x + x2 = 20.340277778

Factor a perfect square on the left side:
(x + 0.5833333335)(x + 0.5833333335) = 20.340277778

Calculate the square root of the right side: 4.510019709

Break this problem into two subproblems by setting 
(x + 0.5833333335) equal to 4.510019709 and -4.510019709.

Subproblem 1

x + 0.5833333335 = 4.510019709 Simplifying x + 0.5833333335 = 4.510019709 Reorder the terms: 0.5833333335 + x = 4.510019709 Solving 0.5833333335 + x = 4.510019709 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 = 4.510019709 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = 4.510019709 + -0.5833333335 x = 4.510019709 + -0.5833333335 Combine like terms: 4.510019709 + -0.5833333335 = 3.9266863755 x = 3.9266863755 Simplifying x = 3.9266863755

Subproblem 2

x + 0.5833333335 = -4.510019709 Simplifying x + 0.5833333335 = -4.510019709 Reorder the terms: 0.5833333335 + x = -4.510019709 Solving 0.5833333335 + x = -4.510019709 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 = -4.510019709 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = -4.510019709 + -0.5833333335 x = -4.510019709 + -0.5833333335 Combine like terms: -4.510019709 + -0.5833333335 = -5.0933530425 x = -5.0933530425 Simplifying x = -5.0933530425

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.9266863755, -5.0933530425}

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