Question

A teacher asked the class to solve the equation 3(x + 2) = 21.

Answer 1

3)distributive property
Robert had given 3 to each term. which then results in 3x+6=21. Then. if he further went on, you would subtract 6 from each side giving you 15 then divide 15 by 3 giving you x=5. 

Answer 2

It is the distubitive property because he got rid of the ( )