Expand (x+y)3 using the Binomial Theorem.

✅ Correct!

Your solution for expanding $(x+y)^3$ using the Binomial Theorem is perfectly done.

• You correctly identified $n=3$, $a=x$, and $b=y$.
• The binomial coefficients $\binom{3}{0}$, $\binom{3}{1}$, $\binom{3}{2}$, and $\binom{3}{3}$ are calculated correctly.
• The exponents for $x$ and $y$ in each term are correct.
• The final sum of the terms is accurate.

Your handwritten note about $y^0=1$ is also a good clarification.