-a^2-22a+121=0

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Solution for -a^2-22a+121=0 equation:


Simplifying
-1a2 + -22a + 121 = 0

Reorder the terms:
121 + -22a + -1a2 = 0

Solving
121 + -22a + -1a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-121 + 22a + a2 = 0

Move the constant term to the right:

Add '121' to each side of the equation.
-121 + 22a + 121 + a2 = 0 + 121

Reorder the terms:
-121 + 121 + 22a + a2 = 0 + 121

Combine like terms: -121 + 121 = 0
0 + 22a + a2 = 0 + 121
22a + a2 = 0 + 121

Combine like terms: 0 + 121 = 121
22a + a2 = 121

The a term is 22a.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22a + 121 + a2 = 121 + 121

Reorder the terms:
121 + 22a + a2 = 121 + 121

Combine like terms: 121 + 121 = 242
121 + 22a + a2 = 242

Factor a perfect square on the left side:
(a + 11)(a + 11) = 242

Calculate the square root of the right side: 15.556349186

Break this problem into two subproblems by setting 
(a + 11) equal to 15.556349186 and -15.556349186.

Subproblem 1

a + 11 = 15.556349186 Simplifying a + 11 = 15.556349186 Reorder the terms: 11 + a = 15.556349186 Solving 11 + a = 15.556349186 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + a = 15.556349186 + -11 Combine like terms: 11 + -11 = 0 0 + a = 15.556349186 + -11 a = 15.556349186 + -11 Combine like terms: 15.556349186 + -11 = 4.556349186 a = 4.556349186 Simplifying a = 4.556349186

Subproblem 2

a + 11 = -15.556349186 Simplifying a + 11 = -15.556349186 Reorder the terms: 11 + a = -15.556349186 Solving 11 + a = -15.556349186 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + a = -15.556349186 + -11 Combine like terms: 11 + -11 = 0 0 + a = -15.556349186 + -11 a = -15.556349186 + -11 Combine like terms: -15.556349186 + -11 = -26.556349186 a = -26.556349186 Simplifying a = -26.556349186

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.556349186, -26.556349186}

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