Answer:
15a^5b^15
Step-by-step explanation:
There's a law of indices which states that when multiplying numbers, if they are the same, the power just add up.
So here 3a^2*5a^3 = 3*5a^2+3, which equals to 15a^5.
As for the b part of the terms, b^7*b^8 = b^7+8, which equals to b^15.
I hope this makes sense.
