In a math equation you can identify the terms as the number or letters separated by a + or -
Then, the expression with three terms is:

A difference in math is a substraction, then the difference with two terms is:

The coeffient in a math expression is the number or factor on the left of a variable:
Then, the expression with a term with coefficient 2 is:

A product in math is a multiplication, and the parts in a multiplication are the factors:
Then, the expression with: a product with a factor of 3 is:
