11x^2+5x=9

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Solution for 11x^2+5x=9 equation:


Simplifying
11x2 + 5x = 9

Reorder the terms:
5x + 11x2 = 9

Solving
5x + 11x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 5x + 11x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 5x + 11x2 = 0

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

Divide each side by '11'.
-0.8181818182 + 0.4545454545x + x2 = 0

Move the constant term to the right:

Add '0.8181818182' to each side of the equation.
-0.8181818182 + 0.4545454545x + 0.8181818182 + x2 = 0 + 0.8181818182

Reorder the terms:
-0.8181818182 + 0.8181818182 + 0.4545454545x + x2 = 0 + 0.8181818182

Combine like terms: -0.8181818182 + 0.8181818182 = 0.0000000000
0.0000000000 + 0.4545454545x + x2 = 0 + 0.8181818182
0.4545454545x + x2 = 0 + 0.8181818182

Combine like terms: 0 + 0.8181818182 = 0.8181818182
0.4545454545x + x2 = 0.8181818182

The x term is 0.4545454545x.  Take half its coefficient (0.2272727273).
Square it (0.05165289257) and add it to both sides.

Add '0.05165289257' to each side of the equation.
0.4545454545x + 0.05165289257 + x2 = 0.8181818182 + 0.05165289257

Reorder the terms:
0.05165289257 + 0.4545454545x + x2 = 0.8181818182 + 0.05165289257

Combine like terms: 0.8181818182 + 0.05165289257 = 0.86983471077
0.05165289257 + 0.4545454545x + x2 = 0.86983471077

Factor a perfect square on the left side:
(x + 0.2272727273)(x + 0.2272727273) = 0.86983471077

Calculate the square root of the right side: 0.932649297

Break this problem into two subproblems by setting 
(x + 0.2272727273) equal to 0.932649297 and -0.932649297.

Subproblem 1

x + 0.2272727273 = 0.932649297 Simplifying x + 0.2272727273 = 0.932649297 Reorder the terms: 0.2272727273 + x = 0.932649297 Solving 0.2272727273 + x = 0.932649297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = 0.932649297 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = 0.932649297 + -0.2272727273 x = 0.932649297 + -0.2272727273 Combine like terms: 0.932649297 + -0.2272727273 = 0.7053765697 x = 0.7053765697 Simplifying x = 0.7053765697

Subproblem 2

x + 0.2272727273 = -0.932649297 Simplifying x + 0.2272727273 = -0.932649297 Reorder the terms: 0.2272727273 + x = -0.932649297 Solving 0.2272727273 + x = -0.932649297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = -0.932649297 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = -0.932649297 + -0.2272727273 x = -0.932649297 + -0.2272727273 Combine like terms: -0.932649297 + -0.2272727273 = -1.1599220243 x = -1.1599220243 Simplifying x = -1.1599220243

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7053765697, -1.1599220243}

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