11x^2+10x-9=0

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


Simplifying
11x2 + 10x + -9 = 0

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

Solving
-9 + 10x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-0.8181818182 + 0.9090909091x + x2 = 0

Move the constant term to the right:

Add '0.8181818182' to each side of the equation.
-0.8181818182 + 0.9090909091x + 0.8181818182 + x2 = 0 + 0.8181818182

Reorder the terms:
-0.8181818182 + 0.8181818182 + 0.9090909091x + x2 = 0 + 0.8181818182

Combine like terms: -0.8181818182 + 0.8181818182 = 0.0000000000
0.0000000000 + 0.9090909091x + x2 = 0 + 0.8181818182
0.9090909091x + x2 = 0 + 0.8181818182

Combine like terms: 0 + 0.8181818182 = 0.8181818182
0.9090909091x + x2 = 0.8181818182

The x term is 0.9090909091x.  Take half its coefficient (0.4545454546).
Square it (0.2066115703) and add it to both sides.

Add '0.2066115703' to each side of the equation.
0.9090909091x + 0.2066115703 + x2 = 0.8181818182 + 0.2066115703

Reorder the terms:
0.2066115703 + 0.9090909091x + x2 = 0.8181818182 + 0.2066115703

Combine like terms: 0.8181818182 + 0.2066115703 = 1.0247933885
0.2066115703 + 0.9090909091x + x2 = 1.0247933885

Factor a perfect square on the left side:
(x + 0.4545454546)(x + 0.4545454546) = 1.0247933885

Calculate the square root of the right side: 1.012320793

Break this problem into two subproblems by setting 
(x + 0.4545454546) equal to 1.012320793 and -1.012320793.

Subproblem 1

x + 0.4545454546 = 1.012320793 Simplifying x + 0.4545454546 = 1.012320793 Reorder the terms: 0.4545454546 + x = 1.012320793 Solving 0.4545454546 + x = 1.012320793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4545454546' to each side of the equation. 0.4545454546 + -0.4545454546 + x = 1.012320793 + -0.4545454546 Combine like terms: 0.4545454546 + -0.4545454546 = 0.0000000000 0.0000000000 + x = 1.012320793 + -0.4545454546 x = 1.012320793 + -0.4545454546 Combine like terms: 1.012320793 + -0.4545454546 = 0.5577753384 x = 0.5577753384 Simplifying x = 0.5577753384

Subproblem 2

x + 0.4545454546 = -1.012320793 Simplifying x + 0.4545454546 = -1.012320793 Reorder the terms: 0.4545454546 + x = -1.012320793 Solving 0.4545454546 + x = -1.012320793 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4545454546' to each side of the equation. 0.4545454546 + -0.4545454546 + x = -1.012320793 + -0.4545454546 Combine like terms: 0.4545454546 + -0.4545454546 = 0.0000000000 0.0000000000 + x = -1.012320793 + -0.4545454546 x = -1.012320793 + -0.4545454546 Combine like terms: -1.012320793 + -0.4545454546 = -1.4668662476 x = -1.4668662476 Simplifying x = -1.4668662476

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5577753384, -1.4668662476}

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