### Home > A2C > Chapter 12 > Lesson 12.4.1 > Problem12-163

12-163.

Use the pattern for $(a + b)^5$ to write the fourth term of $(w - 4z)^5$.

Using Pascal's Triangle, find the pattern for the $4$th term of the $5$th row.

$10a^2b^3$

Substitute $w$ for $a$ and $-4z$ for $b$ and simplify.

$-640w^2z^3$