2x^2+23x=11

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Solution for 2x^2+23x=11 equation:


Simplifying
2x2 + 23x = 11

Reorder the terms:
23x + 2x2 = 11

Solving
23x + 2x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 23x + 2x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 23x + 2x2 = 0

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

Divide each side by '2'.
-5.5 + 11.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 11.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 11.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 11.5x + x2 = 0 + 5.5
11.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
11.5x + x2 = 5.5

The x term is 11.5x.  Take half its coefficient (5.75).
Square it (33.0625) and add it to both sides.

Add '33.0625' to each side of the equation.
11.5x + 33.0625 + x2 = 5.5 + 33.0625

Reorder the terms:
33.0625 + 11.5x + x2 = 5.5 + 33.0625

Combine like terms: 5.5 + 33.0625 = 38.5625
33.0625 + 11.5x + x2 = 38.5625

Factor a perfect square on the left side:
(x + 5.75)(x + 5.75) = 38.5625

Calculate the square root of the right side: 6.209871174

Break this problem into two subproblems by setting 
(x + 5.75) equal to 6.209871174 and -6.209871174.

Subproblem 1

x + 5.75 = 6.209871174 Simplifying x + 5.75 = 6.209871174 Reorder the terms: 5.75 + x = 6.209871174 Solving 5.75 + x = 6.209871174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.75' to each side of the equation. 5.75 + -5.75 + x = 6.209871174 + -5.75 Combine like terms: 5.75 + -5.75 = 0.00 0.00 + x = 6.209871174 + -5.75 x = 6.209871174 + -5.75 Combine like terms: 6.209871174 + -5.75 = 0.459871174 x = 0.459871174 Simplifying x = 0.459871174

Subproblem 2

x + 5.75 = -6.209871174 Simplifying x + 5.75 = -6.209871174 Reorder the terms: 5.75 + x = -6.209871174 Solving 5.75 + x = -6.209871174 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.75' to each side of the equation. 5.75 + -5.75 + x = -6.209871174 + -5.75 Combine like terms: 5.75 + -5.75 = 0.00 0.00 + x = -6.209871174 + -5.75 x = -6.209871174 + -5.75 Combine like terms: -6.209871174 + -5.75 = -11.959871174 x = -11.959871174 Simplifying x = -11.959871174

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.459871174, -11.959871174}

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