15x^2-3x-1=0

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Solution for 15x^2-3x-1=0 equation:


Simplifying
15x2 + -3x + -1 = 0

Reorder the terms:
-1 + -3x + 15x2 = 0

Solving
-1 + -3x + 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'.
-0.06666666667 + -0.2x + x2 = 0

Move the constant term to the right:

Add '0.06666666667' to each side of the equation.
-0.06666666667 + -0.2x + 0.06666666667 + x2 = 0 + 0.06666666667

Reorder the terms:
-0.06666666667 + 0.06666666667 + -0.2x + x2 = 0 + 0.06666666667

Combine like terms: -0.06666666667 + 0.06666666667 = 0.00000000000
0.00000000000 + -0.2x + x2 = 0 + 0.06666666667
-0.2x + x2 = 0 + 0.06666666667

Combine like terms: 0 + 0.06666666667 = 0.06666666667
-0.2x + x2 = 0.06666666667

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 0.06666666667 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 0.06666666667 + 0.01

Combine like terms: 0.06666666667 + 0.01 = 0.07666666667
0.01 + -0.2x + x2 = 0.07666666667

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 0.07666666667

Calculate the square root of the right side: 0.276887462

Break this problem into two subproblems by setting 
(x + -0.1) equal to 0.276887462 and -0.276887462.

Subproblem 1

x + -0.1 = 0.276887462 Simplifying x + -0.1 = 0.276887462 Reorder the terms: -0.1 + x = 0.276887462 Solving -0.1 + x = 0.276887462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 0.276887462 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 0.276887462 + 0.1 x = 0.276887462 + 0.1 Combine like terms: 0.276887462 + 0.1 = 0.376887462 x = 0.376887462 Simplifying x = 0.376887462

Subproblem 2

x + -0.1 = -0.276887462 Simplifying x + -0.1 = -0.276887462 Reorder the terms: -0.1 + x = -0.276887462 Solving -0.1 + x = -0.276887462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -0.276887462 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -0.276887462 + 0.1 x = -0.276887462 + 0.1 Combine like terms: -0.276887462 + 0.1 = -0.176887462 x = -0.176887462 Simplifying x = -0.176887462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.376887462, -0.176887462}

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