Use a generic rectangle to multiply $\left(x+2\right)\left(3x-5\right)$.  

1. What is $\left(3x^2+x-10\right)\div\left(x+2\right)$? How do you know?

   Hint (a):

   $3x^2+x-10$ is the same as $\left(x+2\right)\left(3x-5\right)$.

   Answer (a):

   The product divided by one factor is the other factor.

   $3x-5$

2. Likewise, determine $\left(3x^2+x-10\right)\div\left(3x-5\right)$.

   Hint (b):

   See part (a).