9x^2-10x-15=0

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Solution for 9x^2-10x-15=0 equation:


Simplifying
9x2 + -10x + -15 = 0

Reorder the terms:
-15 + -10x + 9x2 = 0

Solving
-15 + -10x + 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'.
-1.666666667 + -1.111111111x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -1.111111111x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -1.111111111x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -1.111111111x + x2 = 0 + 1.666666667
-1.111111111x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-1.111111111x + x2 = 1.666666667

The x term is -1.111111111x.  Take half its coefficient (-0.5555555555).
Square it (0.3086419752) and add it to both sides.

Add '0.3086419752' to each side of the equation.
-1.111111111x + 0.3086419752 + x2 = 1.666666667 + 0.3086419752

Reorder the terms:
0.3086419752 + -1.111111111x + x2 = 1.666666667 + 0.3086419752

Combine like terms: 1.666666667 + 0.3086419752 = 1.9753086422
0.3086419752 + -1.111111111x + x2 = 1.9753086422

Factor a perfect square on the left side:
(x + -0.5555555555)(x + -0.5555555555) = 1.9753086422

Calculate the square root of the right side: 1.405456738

Break this problem into two subproblems by setting 
(x + -0.5555555555) equal to 1.405456738 and -1.405456738.

Subproblem 1

x + -0.5555555555 = 1.405456738 Simplifying x + -0.5555555555 = 1.405456738 Reorder the terms: -0.5555555555 + x = 1.405456738 Solving -0.5555555555 + x = 1.405456738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5555555555' to each side of the equation. -0.5555555555 + 0.5555555555 + x = 1.405456738 + 0.5555555555 Combine like terms: -0.5555555555 + 0.5555555555 = 0.0000000000 0.0000000000 + x = 1.405456738 + 0.5555555555 x = 1.405456738 + 0.5555555555 Combine like terms: 1.405456738 + 0.5555555555 = 1.9610122935 x = 1.9610122935 Simplifying x = 1.9610122935

Subproblem 2

x + -0.5555555555 = -1.405456738 Simplifying x + -0.5555555555 = -1.405456738 Reorder the terms: -0.5555555555 + x = -1.405456738 Solving -0.5555555555 + x = -1.405456738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5555555555' to each side of the equation. -0.5555555555 + 0.5555555555 + x = -1.405456738 + 0.5555555555 Combine like terms: -0.5555555555 + 0.5555555555 = 0.0000000000 0.0000000000 + x = -1.405456738 + 0.5555555555 x = -1.405456738 + 0.5555555555 Combine like terms: -1.405456738 + 0.5555555555 = -0.8499011825 x = -0.8499011825 Simplifying x = -0.8499011825

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9610122935, -0.8499011825}

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