1. ## I need help understanding this please.

Use the product rule for exponents to simplify the expression. Write the result using exponents.a8b4 · a8b9

2. ## Re: I need help understanding this please.

Basically they want you to do $x^a x^b = x^{a+b}$

For ex, $2^2 * 2^3 = 2^{2+3}$

3. ## Re: I need help understanding this please.

$a^8b^4 \cdot a^8b^9 = a^{8+8}b^{4+9}$