9x^2-15x-4=0

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Solution for 9x^2-15x-4=0 equation:


Simplifying
9x2 + -15x + -4 = 0

Reorder the terms:
-4 + -15x + 9x2 = 0

Solving
-4 + -15x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.4444444444 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -1.666666667x + 0.4444444444 + x2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -1.666666667x + x2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -1.666666667x + x2 = 0 + 0.4444444444
-1.666666667x + x2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-1.666666667x + x2 = 0.4444444444

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 0.4444444444 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 0.4444444444 + 0.6944444447

Combine like terms: 0.4444444444 + 0.6944444447 = 1.1388888891
0.6944444447 + -1.666666667x + x2 = 1.1388888891

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 1.1388888891

Calculate the square root of the right side: 1.067187373

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 1.067187373 and -1.067187373.

Subproblem 1

x + -0.8333333335 = 1.067187373 Simplifying x + -0.8333333335 = 1.067187373 Reorder the terms: -0.8333333335 + x = 1.067187373 Solving -0.8333333335 + x = 1.067187373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 1.067187373 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 1.067187373 + 0.8333333335 x = 1.067187373 + 0.8333333335 Combine like terms: 1.067187373 + 0.8333333335 = 1.9005207065 x = 1.9005207065 Simplifying x = 1.9005207065

Subproblem 2

x + -0.8333333335 = -1.067187373 Simplifying x + -0.8333333335 = -1.067187373 Reorder the terms: -0.8333333335 + x = -1.067187373 Solving -0.8333333335 + x = -1.067187373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -1.067187373 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -1.067187373 + 0.8333333335 x = -1.067187373 + 0.8333333335 Combine like terms: -1.067187373 + 0.8333333335 = -0.2338540395 x = -0.2338540395 Simplifying x = -0.2338540395

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9005207065, -0.2338540395}

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