Chapter 8, Sequences and Series - Section 8.6 - The Binomial Theorem - 8.6 Exercises - Page 636: 2

Pascal's Triangle $(a+b)^{4}=1a^{4}+4a^{3}b+6a^{2}b^{2}+4ab^{3}+1b^{4}$

We can find the coefficients in the expansion of $(a+b)^{n}$ from the $n$th row of ___Pascal's___ Triangle. So $(a+b)^{4}=1a^{4}+4a^{3}b+6a^{2}b^{2}+4ab^{3}+1b^{4}$