Question

Pls help i don’t understand

Answer 1

Answer:

r + 7 is a factor.

Step-by-step explanation:

You have to divide $3r^{4} +23r^{3} +15r^{2} +r - 42$ by r + 7.  If the remainder is 0, then r + 7 is a factor of  $3r^{4} +23r^{3} +15r^{2} +r - 42$.

I did that and the remainder was 0.

So, yes, r + 7 is a factor.  

You will need to learn how to do that division in order to solve this problem.  OK?