Rewrite as .

Expand by multiplying each term in the first expression by each term in the second expression.

Simplify each term.

Multiply by .

Move to the left of .

Multiply by .

Move to the left of .

Multiply by .

Simplify by adding terms.

Add and .

Add and .

Reorder and .

Add and .

Move .

Move .

Move .

Simplify (3+a+b)^2