Question

What expression is equal to 12m+12n 

A.12mn
B.12m+n
C.12m-12n
D.12(m+n) 
explain plz

Answer 1

To check equality we can try transform info correct form.

First, we can take 12 in front of parenthesis.
12m+12n=12(m+n)
We can do this because factor in front of paranthesis mean that all argument from paranthesis are multiplied by this factor.
We cant say that 12m+12n is equal to 12mn because we cant multiply
`m*n` here.
12m-12n is not correct too.