Use the binomial expansion theorem to find each term. The binomial theorem states .

Expand the summation.

Simplify the exponents for each term of the expansion.

Multiply by .

Apply the product rule to .

Multiply by by adding the exponents.

Move .

Use the power rule to combine exponents.

Add and .

Raise to the power of .

Simplify.

Multiply by .

Evaluate the exponent.

Multiply by .

Multiply by .

Apply the product rule to .

Multiply by by adding the exponents.

Move .

Use the power rule to combine exponents.

Add and .

Simplify .

Raise to the power of .

Expand using the Binomial Theorem (7x+7)^2