15x^2+x-0.09=0

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Solution for 15x^2+x-0.09=0 equation:


Simplifying
15x2 + x + -0.09 = 0

Reorder the terms:
-0.09 + x + 15x2 = 0

Solving
-0.09 + x + 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'.
-0.006 + 0.06666666667x + x2 = 0

Move the constant term to the right:

Add '0.006' to each side of the equation.
-0.006 + 0.06666666667x + 0.006 + x2 = 0 + 0.006

Reorder the terms:
-0.006 + 0.006 + 0.06666666667x + x2 = 0 + 0.006

Combine like terms: -0.006 + 0.006 = 0.000
0.000 + 0.06666666667x + x2 = 0 + 0.006
0.06666666667x + x2 = 0 + 0.006

Combine like terms: 0 + 0.006 = 0.006
0.06666666667x + x2 = 0.006

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.06666666667x + 0.25 + x2 = 0.006 + 0.25

Reorder the terms:
0.25 + 0.06666666667x + x2 = 0.006 + 0.25

Combine like terms: 0.006 + 0.25 = 0.256
0.25 + 0.06666666667x + x2 = 0.256

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.256

Calculate the square root of the right side: 0.505964426

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.505964426 and -0.505964426.

Subproblem 1

x + 0.5 = 0.505964426 Simplifying x + 0.5 = 0.505964426 Reorder the terms: 0.5 + x = 0.505964426 Solving 0.5 + x = 0.505964426 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.505964426 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.505964426 + -0.5 x = 0.505964426 + -0.5 Combine like terms: 0.505964426 + -0.5 = 0.005964426 x = 0.005964426 Simplifying x = 0.005964426

Subproblem 2

x + 0.5 = -0.505964426 Simplifying x + 0.5 = -0.505964426 Reorder the terms: 0.5 + x = -0.505964426 Solving 0.5 + x = -0.505964426 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.505964426 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.505964426 + -0.5 x = -0.505964426 + -0.5 Combine like terms: -0.505964426 + -0.5 = -1.005964426 x = -1.005964426 Simplifying x = -1.005964426

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.005964426, -1.005964426}

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