15x^2+2x=12

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Solution for 15x^2+2x=12 equation:


Simplifying
15x2 + 2x = 12

Reorder the terms:
2x + 15x2 = 12

Solving
2x + 15x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 2x + 15x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 2x + 15x2 = 0

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

Divide each side by '15'.
-0.8 + 0.1333333333x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 0.1333333333x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 0.1333333333x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 0.1333333333x + x2 = 0 + 0.8
0.1333333333x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
0.1333333333x + x2 = 0.8

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 = 0.8 + 0.004444444442

Reorder the terms:
0.004444444442 + 0.1333333333x + x2 = 0.8 + 0.004444444442

Combine like terms: 0.8 + 0.004444444442 = 0.804444444442
0.004444444442 + 0.1333333333x + x2 = 0.804444444442

Factor a perfect square on the left side:
(x + 0.06666666665)(x + 0.06666666665) = 0.804444444442

Calculate the square root of the right side: 0.89690827

Break this problem into two subproblems by setting 
(x + 0.06666666665) equal to 0.89690827 and -0.89690827.

Subproblem 1

x + 0.06666666665 = 0.89690827 Simplifying x + 0.06666666665 = 0.89690827 Reorder the terms: 0.06666666665 + x = 0.89690827 Solving 0.06666666665 + x = 0.89690827 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 = 0.89690827 + -0.06666666665 Combine like terms: 0.06666666665 + -0.06666666665 = 0.00000000000 0.00000000000 + x = 0.89690827 + -0.06666666665 x = 0.89690827 + -0.06666666665 Combine like terms: 0.89690827 + -0.06666666665 = 0.83024160335 x = 0.83024160335 Simplifying x = 0.83024160335

Subproblem 2

x + 0.06666666665 = -0.89690827 Simplifying x + 0.06666666665 = -0.89690827 Reorder the terms: 0.06666666665 + x = -0.89690827 Solving 0.06666666665 + x = -0.89690827 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 = -0.89690827 + -0.06666666665 Combine like terms: 0.06666666665 + -0.06666666665 = 0.00000000000 0.00000000000 + x = -0.89690827 + -0.06666666665 x = -0.89690827 + -0.06666666665 Combine like terms: -0.89690827 + -0.06666666665 = -0.96357493665 x = -0.96357493665 Simplifying x = -0.96357493665

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.83024160335, -0.96357493665}

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