12x^2+14x-15=0

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Solution for 12x^2+14x-15=0 equation:


Simplifying
12x2 + 14x + -15 = 0

Reorder the terms:
-15 + 14x + 12x2 = 0

Solving
-15 + 14x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-1.25 + 1.166666667x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 1.166666667x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 1.166666667x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 1.166666667x + x2 = 0 + 1.25
1.166666667x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
1.166666667x + x2 = 1.25

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 = 1.25 + 0.3402777780

Reorder the terms:
0.3402777780 + 1.166666667x + x2 = 1.25 + 0.3402777780

Combine like terms: 1.25 + 0.3402777780 = 1.590277778
0.3402777780 + 1.166666667x + x2 = 1.590277778

Factor a perfect square on the left side:
(x + 0.5833333335)(x + 0.5833333335) = 1.590277778

Calculate the square root of the right side: 1.261062163

Break this problem into two subproblems by setting 
(x + 0.5833333335) equal to 1.261062163 and -1.261062163.

Subproblem 1

x + 0.5833333335 = 1.261062163 Simplifying x + 0.5833333335 = 1.261062163 Reorder the terms: 0.5833333335 + x = 1.261062163 Solving 0.5833333335 + x = 1.261062163 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 = 1.261062163 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = 1.261062163 + -0.5833333335 x = 1.261062163 + -0.5833333335 Combine like terms: 1.261062163 + -0.5833333335 = 0.6777288295 x = 0.6777288295 Simplifying x = 0.6777288295

Subproblem 2

x + 0.5833333335 = -1.261062163 Simplifying x + 0.5833333335 = -1.261062163 Reorder the terms: 0.5833333335 + x = -1.261062163 Solving 0.5833333335 + x = -1.261062163 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 = -1.261062163 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + x = -1.261062163 + -0.5833333335 x = -1.261062163 + -0.5833333335 Combine like terms: -1.261062163 + -0.5833333335 = -1.8443954965 x = -1.8443954965 Simplifying x = -1.8443954965

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6777288295, -1.8443954965}

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