A^2+11A=121

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Solution for A^2+11A=121 equation:


Simplifying
A2 + 11A = 121

Reorder the terms:
11A + A2 = 121

Solving
11A + A2 = 121

Solving for variable 'A'.

Reorder the terms:
-121 + 11A + A2 = 121 + -121

Combine like terms: 121 + -121 = 0
-121 + 11A + A2 = 0

Begin completing the square.

Move the constant term to the right:

Add '121' to each side of the equation.
-121 + 11A + 121 + A2 = 0 + 121

Reorder the terms:
-121 + 121 + 11A + A2 = 0 + 121

Combine like terms: -121 + 121 = 0
0 + 11A + A2 = 0 + 121
11A + A2 = 0 + 121

Combine like terms: 0 + 121 = 121
11A + A2 = 121

The A term is 11A.  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.
11A + 30.25 + A2 = 121 + 30.25

Reorder the terms:
30.25 + 11A + A2 = 121 + 30.25

Combine like terms: 121 + 30.25 = 151.25
30.25 + 11A + A2 = 151.25

Factor a perfect square on the left side:
(A + 5.5)(A + 5.5) = 151.25

Calculate the square root of the right side: 12.298373876

Break this problem into two subproblems by setting 
(A + 5.5) equal to 12.298373876 and -12.298373876.

Subproblem 1

A + 5.5 = 12.298373876 Simplifying A + 5.5 = 12.298373876 Reorder the terms: 5.5 + A = 12.298373876 Solving 5.5 + A = 12.298373876 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + A = 12.298373876 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + A = 12.298373876 + -5.5 A = 12.298373876 + -5.5 Combine like terms: 12.298373876 + -5.5 = 6.798373876 A = 6.798373876 Simplifying A = 6.798373876

Subproblem 2

A + 5.5 = -12.298373876 Simplifying A + 5.5 = -12.298373876 Reorder the terms: 5.5 + A = -12.298373876 Solving 5.5 + A = -12.298373876 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + A = -12.298373876 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + A = -12.298373876 + -5.5 A = -12.298373876 + -5.5 Combine like terms: -12.298373876 + -5.5 = -17.798373876 A = -17.798373876 Simplifying A = -17.798373876

Solution

The solution to the problem is based on the solutions from the subproblems. A = {6.798373876, -17.798373876}

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