Answer:
[tex]\frac{4^{15} }{b^{21} }[/tex]
Step-by-step explanation:
First, multiply the exponent 7 and the -3 together, giving you:
[tex]b^{-21}[/tex]
Then, multiply the exponent 5 and the -3 together, giving you:
[tex]4^{-15}[/tex]
But since you can't have a negative exponent, you need to switch the numbers in their places. This is because, when you have a negative exponent, you either switch it to under 1 or over 1, depending on where it currently is:
[tex]\frac{4^{15} }{b^{21} }[/tex]
