-2a^2+22a+121=0

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


Simplifying
-2a2 + 22a + 121 = 0

Reorder the terms:
121 + 22a + -2a2 = 0

Solving
121 + 22a + -2a2 = 0

Solving for variable 'a'.

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

Divide each side by '-2'.
-60.5 + -11a + a2 = 0

Move the constant term to the right:

Add '60.5' to each side of the equation.
-60.5 + -11a + 60.5 + a2 = 0 + 60.5

Reorder the terms:
-60.5 + 60.5 + -11a + a2 = 0 + 60.5

Combine like terms: -60.5 + 60.5 = 0.0
0.0 + -11a + a2 = 0 + 60.5
-11a + a2 = 0 + 60.5

Combine like terms: 0 + 60.5 = 60.5
-11a + a2 = 60.5

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 = 60.5 + 30.25

Reorder the terms:
30.25 + -11a + a2 = 60.5 + 30.25

Combine like terms: 60.5 + 30.25 = 90.75
30.25 + -11a + a2 = 90.75

Factor a perfect square on the left side:
(a + -5.5)(a + -5.5) = 90.75

Calculate the square root of the right side: 9.526279442

Break this problem into two subproblems by setting 
(a + -5.5) equal to 9.526279442 and -9.526279442.

Subproblem 1

a + -5.5 = 9.526279442 Simplifying a + -5.5 = 9.526279442 Reorder the terms: -5.5 + a = 9.526279442 Solving -5.5 + a = 9.526279442 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 = 9.526279442 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + a = 9.526279442 + 5.5 a = 9.526279442 + 5.5 Combine like terms: 9.526279442 + 5.5 = 15.026279442 a = 15.026279442 Simplifying a = 15.026279442

Subproblem 2

a + -5.5 = -9.526279442 Simplifying a + -5.5 = -9.526279442 Reorder the terms: -5.5 + a = -9.526279442 Solving -5.5 + a = -9.526279442 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 = -9.526279442 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + a = -9.526279442 + 5.5 a = -9.526279442 + 5.5 Combine like terms: -9.526279442 + 5.5 = -4.026279442 a = -4.026279442 Simplifying a = -4.026279442

Solution

The solution to the problem is based on the solutions from the subproblems. a = {15.026279442, -4.026279442}

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