how do you factor this?

a4b + a5b + 3

a4b(a+ab+3)

a4b + a5b + 3

What factors do all expressions have in common?

Answer, none

This cannot be factored.

All you could do is,
a4b + a5b + 3
ab (4 + 5) + 3

To factor the expression "a^4b + a^5b + 3," we can first look for any common factors among the terms. In this case, we have a common factor of "b" in each term:

a^4b + a^5b + 3
b(a^4 + a^5) + 3

Now, let's focus on the terms inside the parentheses "(a^4 + a^5)." Notice that "a^4" is common in both terms, so we can factor it out:

b(a^4 + a^5) + 3
b(a^4(1 + a)) + 3

As a result, the factored form of the expression "a^4b + a^5b + 3" is "b(a^4(1 + a)) + 3".