15x^2-16x-9=0

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Solution for 15x^2-16x-9=0 equation:


Simplifying
15x2 + -16x + -9 = 0

Reorder the terms:
-9 + -16x + 15x2 = 0

Solving
-9 + -16x + 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'.
-0.6 + -1.066666667x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -1.066666667x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -1.066666667x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -1.066666667x + x2 = 0 + 0.6
-1.066666667x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-1.066666667x + x2 = 0.6

The x term is -1.066666667x.  Take half its coefficient (-0.5333333335).
Square it (0.2844444446) and add it to both sides.

Add '0.2844444446' to each side of the equation.
-1.066666667x + 0.2844444446 + x2 = 0.6 + 0.2844444446

Reorder the terms:
0.2844444446 + -1.066666667x + x2 = 0.6 + 0.2844444446

Combine like terms: 0.6 + 0.2844444446 = 0.8844444446
0.2844444446 + -1.066666667x + x2 = 0.8844444446

Factor a perfect square on the left side:
(x + -0.5333333335)(x + -0.5333333335) = 0.8844444446

Calculate the square root of the right side: 0.940449065

Break this problem into two subproblems by setting 
(x + -0.5333333335) equal to 0.940449065 and -0.940449065.

Subproblem 1

x + -0.5333333335 = 0.940449065 Simplifying x + -0.5333333335 = 0.940449065 Reorder the terms: -0.5333333335 + x = 0.940449065 Solving -0.5333333335 + x = 0.940449065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + x = 0.940449065 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + x = 0.940449065 + 0.5333333335 x = 0.940449065 + 0.5333333335 Combine like terms: 0.940449065 + 0.5333333335 = 1.4737823985 x = 1.4737823985 Simplifying x = 1.4737823985

Subproblem 2

x + -0.5333333335 = -0.940449065 Simplifying x + -0.5333333335 = -0.940449065 Reorder the terms: -0.5333333335 + x = -0.940449065 Solving -0.5333333335 + x = -0.940449065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + x = -0.940449065 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + x = -0.940449065 + 0.5333333335 x = -0.940449065 + 0.5333333335 Combine like terms: -0.940449065 + 0.5333333335 = -0.4071157315 x = -0.4071157315 Simplifying x = -0.4071157315

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4737823985, -0.4071157315}

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