15x^2-23x-5=0

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Solution for 15x^2-23x-5=0 equation:


Simplifying
15x2 + -23x + -5 = 0

Reorder the terms:
-5 + -23x + 15x2 = 0

Solving
-5 + -23x + 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'.
-0.3333333333 + -1.533333333x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -1.533333333x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -1.533333333x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -1.533333333x + x2 = 0 + 0.3333333333
-1.533333333x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-1.533333333x + x2 = 0.3333333333

The x term is -1.533333333x.  Take half its coefficient (-0.7666666665).
Square it (0.5877777775) and add it to both sides.

Add '0.5877777775' to each side of the equation.
-1.533333333x + 0.5877777775 + x2 = 0.3333333333 + 0.5877777775

Reorder the terms:
0.5877777775 + -1.533333333x + x2 = 0.3333333333 + 0.5877777775

Combine like terms: 0.3333333333 + 0.5877777775 = 0.9211111108
0.5877777775 + -1.533333333x + x2 = 0.9211111108

Factor a perfect square on the left side:
(x + -0.7666666665)(x + -0.7666666665) = 0.9211111108

Calculate the square root of the right side: 0.959745336

Break this problem into two subproblems by setting 
(x + -0.7666666665) equal to 0.959745336 and -0.959745336.

Subproblem 1

x + -0.7666666665 = 0.959745336 Simplifying x + -0.7666666665 = 0.959745336 Reorder the terms: -0.7666666665 + x = 0.959745336 Solving -0.7666666665 + x = 0.959745336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7666666665' to each side of the equation. -0.7666666665 + 0.7666666665 + x = 0.959745336 + 0.7666666665 Combine like terms: -0.7666666665 + 0.7666666665 = 0.0000000000 0.0000000000 + x = 0.959745336 + 0.7666666665 x = 0.959745336 + 0.7666666665 Combine like terms: 0.959745336 + 0.7666666665 = 1.7264120025 x = 1.7264120025 Simplifying x = 1.7264120025

Subproblem 2

x + -0.7666666665 = -0.959745336 Simplifying x + -0.7666666665 = -0.959745336 Reorder the terms: -0.7666666665 + x = -0.959745336 Solving -0.7666666665 + x = -0.959745336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7666666665' to each side of the equation. -0.7666666665 + 0.7666666665 + x = -0.959745336 + 0.7666666665 Combine like terms: -0.7666666665 + 0.7666666665 = 0.0000000000 0.0000000000 + x = -0.959745336 + 0.7666666665 x = -0.959745336 + 0.7666666665 Combine like terms: -0.959745336 + 0.7666666665 = -0.1930786695 x = -0.1930786695 Simplifying x = -0.1930786695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.7264120025, -0.1930786695}

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