a^2+11a+18=1

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Solution for a^2+11a+18=1 equation:


Simplifying
a2 + 11a + 18 = 1

Reorder the terms:
18 + 11a + a2 = 1

Solving
18 + 11a + a2 = 1

Solving for variable 'a'.

Reorder the terms:
18 + -1 + 11a + a2 = 1 + -1

Combine like terms: 18 + -1 = 17
17 + 11a + a2 = 1 + -1

Combine like terms: 1 + -1 = 0
17 + 11a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + 11a + -17 + a2 = 0 + -17

Reorder the terms:
17 + -17 + 11a + a2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 11a + a2 = 0 + -17
11a + a2 = 0 + -17

Combine like terms: 0 + -17 = -17
11a + a2 = -17

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 = -17 + 30.25

Reorder the terms:
30.25 + 11a + a2 = -17 + 30.25

Combine like terms: -17 + 30.25 = 13.25
30.25 + 11a + a2 = 13.25

Factor a perfect square on the left side:
(a + 5.5)(a + 5.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(a + 5.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

a + 5.5 = 3.640054945 Simplifying a + 5.5 = 3.640054945 Reorder the terms: 5.5 + a = 3.640054945 Solving 5.5 + a = 3.640054945 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 = 3.640054945 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + a = 3.640054945 + -5.5 a = 3.640054945 + -5.5 Combine like terms: 3.640054945 + -5.5 = -1.859945055 a = -1.859945055 Simplifying a = -1.859945055

Subproblem 2

a + 5.5 = -3.640054945 Simplifying a + 5.5 = -3.640054945 Reorder the terms: 5.5 + a = -3.640054945 Solving 5.5 + a = -3.640054945 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 = -3.640054945 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + a = -3.640054945 + -5.5 a = -3.640054945 + -5.5 Combine like terms: -3.640054945 + -5.5 = -9.140054945 a = -9.140054945 Simplifying a = -9.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. a = {-1.859945055, -9.140054945}

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