15x^2-2x-6=0

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


Simplifying
15x2 + -2x + -6 = 0

Reorder the terms:
-6 + -2x + 15x2 = 0

Solving
-6 + -2x + 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 + -0.1333333333x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -0.1333333333x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -0.1333333333x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -0.1333333333x + x2 = 0 + 0.4
-0.1333333333x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-0.1333333333x + x2 = 0.4

The x term is -0.1333333333x.  Take half its coefficient (-0.06666666665).
Square it (0.004444444442) and add it to both sides.

Add '0.004444444442' to each side of the equation.
-0.1333333333x + 0.004444444442 + x2 = 0.4 + 0.004444444442

Reorder the terms:
0.004444444442 + -0.1333333333x + x2 = 0.4 + 0.004444444442

Combine like terms: 0.4 + 0.004444444442 = 0.404444444442
0.004444444442 + -0.1333333333x + x2 = 0.404444444442

Factor a perfect square on the left side:
(x + -0.06666666665)(x + -0.06666666665) = 0.404444444442

Calculate the square root of the right side: 0.635959468

Break this problem into two subproblems by setting 
(x + -0.06666666665) equal to 0.635959468 and -0.635959468.

Subproblem 1

x + -0.06666666665 = 0.635959468 Simplifying x + -0.06666666665 = 0.635959468 Reorder the terms: -0.06666666665 + x = 0.635959468 Solving -0.06666666665 + x = 0.635959468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06666666665' to each side of the equation. -0.06666666665 + 0.06666666665 + x = 0.635959468 + 0.06666666665 Combine like terms: -0.06666666665 + 0.06666666665 = 0.00000000000 0.00000000000 + x = 0.635959468 + 0.06666666665 x = 0.635959468 + 0.06666666665 Combine like terms: 0.635959468 + 0.06666666665 = 0.70262613465 x = 0.70262613465 Simplifying x = 0.70262613465

Subproblem 2

x + -0.06666666665 = -0.635959468 Simplifying x + -0.06666666665 = -0.635959468 Reorder the terms: -0.06666666665 + x = -0.635959468 Solving -0.06666666665 + x = -0.635959468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06666666665' to each side of the equation. -0.06666666665 + 0.06666666665 + x = -0.635959468 + 0.06666666665 Combine like terms: -0.06666666665 + 0.06666666665 = 0.00000000000 0.00000000000 + x = -0.635959468 + 0.06666666665 x = -0.635959468 + 0.06666666665 Combine like terms: -0.635959468 + 0.06666666665 = -0.56929280135 x = -0.56929280135 Simplifying x = -0.56929280135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.70262613465, -0.56929280135}

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