10x^2-11x-9=0

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Solution for 10x^2-11x-9=0 equation:


Simplifying
10x2 + -11x + -9 = 0

Reorder the terms:
-9 + -11x + 10x2 = 0

Solving
-9 + -11x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.9 + -1.1x + x2 = 0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + -1.1x + 0.9 + x2 = 0 + 0.9

Reorder the terms:
-0.9 + 0.9 + -1.1x + x2 = 0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -1.1x + x2 = 0 + 0.9
-1.1x + x2 = 0 + 0.9

Combine like terms: 0 + 0.9 = 0.9
-1.1x + x2 = 0.9

The x term is -1.1x.  Take half its coefficient (-0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
-1.1x + 0.3025 + x2 = 0.9 + 0.3025

Reorder the terms:
0.3025 + -1.1x + x2 = 0.9 + 0.3025

Combine like terms: 0.9 + 0.3025 = 1.2025
0.3025 + -1.1x + x2 = 1.2025

Factor a perfect square on the left side:
(x + -0.55)(x + -0.55) = 1.2025

Calculate the square root of the right side: 1.09658561

Break this problem into two subproblems by setting 
(x + -0.55) equal to 1.09658561 and -1.09658561.

Subproblem 1

x + -0.55 = 1.09658561 Simplifying x + -0.55 = 1.09658561 Reorder the terms: -0.55 + x = 1.09658561 Solving -0.55 + x = 1.09658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = 1.09658561 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = 1.09658561 + 0.55 x = 1.09658561 + 0.55 Combine like terms: 1.09658561 + 0.55 = 1.64658561 x = 1.64658561 Simplifying x = 1.64658561

Subproblem 2

x + -0.55 = -1.09658561 Simplifying x + -0.55 = -1.09658561 Reorder the terms: -0.55 + x = -1.09658561 Solving -0.55 + x = -1.09658561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = -1.09658561 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = -1.09658561 + 0.55 x = -1.09658561 + 0.55 Combine like terms: -1.09658561 + 0.55 = -0.54658561 x = -0.54658561 Simplifying x = -0.54658561

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.64658561, -0.54658561}

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