x(x+1)=11

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Solution for x(x+1)=11 equation:


Simplifying
x(x + 1) = 11

Reorder the terms:
x(1 + x) = 11
(1 * x + x * x) = 11
(1x + x2) = 11

Solving
1x + x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 1x + x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 1x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 1x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 1x + x2 = 0 + 11
1x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
1x + x2 = 11

The x term is 1x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 11 + 0.25

Reorder the terms:
0.25 + x + x2 = 11 + 0.25

Combine like terms: 11 + 0.25 = 11.25
0.25 + x + x2 = 11.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

x + 0.5 = 3.354101966 Simplifying x + 0.5 = 3.354101966 Reorder the terms: 0.5 + x = 3.354101966 Solving 0.5 + x = 3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.354101966 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.354101966 + -0.5 x = 3.354101966 + -0.5 Combine like terms: 3.354101966 + -0.5 = 2.854101966 x = 2.854101966 Simplifying x = 2.854101966

Subproblem 2

x + 0.5 = -3.354101966 Simplifying x + 0.5 = -3.354101966 Reorder the terms: 0.5 + x = -3.354101966 Solving 0.5 + x = -3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.354101966 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.354101966 + -0.5 x = -3.354101966 + -0.5 Combine like terms: -3.354101966 + -0.5 = -3.854101966 x = -3.854101966 Simplifying x = -3.854101966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.854101966, -3.854101966}

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