Question

What is the product of the expression (r - 7) (x-3)?

Answer 1

rx-3r-7x+21

Explanation:

Since you don't know what r or x stand for, you need to distribute.

First, you would do r(x-3)-7(x-3)

Then, you would distribute again to make it rx-3r-7(x-3)

Last, you would distribute AGAIN to make it rx-3r-7x+21

The 21 comes from 7·x and 7·3

Answer 2

the ration is 3:7r

Explanation: