10=a^2+6a+9

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Solution for 10=a^2+6a+9 equation:


Simplifying
10 = a2 + 6a + 9

Reorder the terms:
10 = 9 + 6a + a2

Solving
10 = 9 + 6a + a2

Solving for variable 'a'.

Combine like terms: 10 + -9 = 1
1 + -6a + -1a2 = 9 + 6a + a2 + -9 + -6a + -1a2

Reorder the terms:
1 + -6a + -1a2 = 9 + -9 + 6a + -6a + a2 + -1a2

Combine like terms: 9 + -9 = 0
1 + -6a + -1a2 = 0 + 6a + -6a + a2 + -1a2
1 + -6a + -1a2 = 6a + -6a + a2 + -1a2

Combine like terms: 6a + -6a = 0
1 + -6a + -1a2 = 0 + a2 + -1a2
1 + -6a + -1a2 = a2 + -1a2

Combine like terms: a2 + -1a2 = 0
1 + -6a + -1a2 = 0

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

Divide each side by '-1'.
-1 + 6a + a2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 6a + 1 + a2 = 0 + 1

Reorder the terms:
-1 + 1 + 6a + a2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 6a + a2 = 0 + 1
6a + a2 = 0 + 1

Combine like terms: 0 + 1 = 1
6a + a2 = 1

The a term is 6a.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6a + 9 + a2 = 1 + 9

Reorder the terms:
9 + 6a + a2 = 1 + 9

Combine like terms: 1 + 9 = 10
9 + 6a + a2 = 10

Factor a perfect square on the left side:
(a + 3)(a + 3) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(a + 3) equal to 3.16227766 and -3.16227766.

Subproblem 1

a + 3 = 3.16227766 Simplifying a + 3 = 3.16227766 Reorder the terms: 3 + a = 3.16227766 Solving 3 + a = 3.16227766 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = 3.16227766 + -3 Combine like terms: 3 + -3 = 0 0 + a = 3.16227766 + -3 a = 3.16227766 + -3 Combine like terms: 3.16227766 + -3 = 0.16227766 a = 0.16227766 Simplifying a = 0.16227766

Subproblem 2

a + 3 = -3.16227766 Simplifying a + 3 = -3.16227766 Reorder the terms: 3 + a = -3.16227766 Solving 3 + a = -3.16227766 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = -3.16227766 + -3 Combine like terms: 3 + -3 = 0 0 + a = -3.16227766 + -3 a = -3.16227766 + -3 Combine like terms: -3.16227766 + -3 = -6.16227766 a = -6.16227766 Simplifying a = -6.16227766

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.16227766, -6.16227766}

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