x^2+11x=23

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


Simplifying
x2 + 11x = 23

Reorder the terms:
11x + x2 = 23

Solving
11x + x2 = 23

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 11x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + 11x + x2 = 0 + 23

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

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

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 23 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 23 + 30.25

Combine like terms: 23 + 30.25 = 53.25
30.25 + 11x + x2 = 53.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 53.25

Calculate the square root of the right side: 7.29725976

Break this problem into two subproblems by setting 
(x + 5.5) equal to 7.29725976 and -7.29725976.

Subproblem 1

x + 5.5 = 7.29725976 Simplifying x + 5.5 = 7.29725976 Reorder the terms: 5.5 + x = 7.29725976 Solving 5.5 + x = 7.29725976 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 7.29725976 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 7.29725976 + -5.5 x = 7.29725976 + -5.5 Combine like terms: 7.29725976 + -5.5 = 1.79725976 x = 1.79725976 Simplifying x = 1.79725976

Subproblem 2

x + 5.5 = -7.29725976 Simplifying x + 5.5 = -7.29725976 Reorder the terms: 5.5 + x = -7.29725976 Solving 5.5 + x = -7.29725976 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -7.29725976 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -7.29725976 + -5.5 x = -7.29725976 + -5.5 Combine like terms: -7.29725976 + -5.5 = -12.79725976 x = -12.79725976 Simplifying x = -12.79725976

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.79725976, -12.79725976}

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