15x^2+10x-6=0

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Solution for 15x^2+10x-6=0 equation:


Simplifying
15x2 + 10x + -6 = 0

Reorder the terms:
-6 + 10x + 15x2 = 0

Solving
-6 + 10x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-0.4 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.6666666667x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.6666666667x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.6666666667x + x2 = 0 + 0.4
0.6666666667x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
0.6666666667x + x2 = 0.4

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 0.4 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 0.4 + 0.1111111112

Combine like terms: 0.4 + 0.1111111112 = 0.5111111112
0.1111111112 + 0.6666666667x + x2 = 0.5111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 0.5111111112

Calculate the square root of the right side: 0.714920353

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 0.714920353 and -0.714920353.

Subproblem 1

x + 0.3333333334 = 0.714920353 Simplifying x + 0.3333333334 = 0.714920353 Reorder the terms: 0.3333333334 + x = 0.714920353 Solving 0.3333333334 + x = 0.714920353 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 0.714920353 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 0.714920353 + -0.3333333334 x = 0.714920353 + -0.3333333334 Combine like terms: 0.714920353 + -0.3333333334 = 0.3815870196 x = 0.3815870196 Simplifying x = 0.3815870196

Subproblem 2

x + 0.3333333334 = -0.714920353 Simplifying x + 0.3333333334 = -0.714920353 Reorder the terms: 0.3333333334 + x = -0.714920353 Solving 0.3333333334 + x = -0.714920353 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -0.714920353 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -0.714920353 + -0.3333333334 x = -0.714920353 + -0.3333333334 Combine like terms: -0.714920353 + -0.3333333334 = -1.0482536864 x = -1.0482536864 Simplifying x = -1.0482536864

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3815870196, -1.0482536864}

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