real = 2 imaginary = 6i
there's only two terms in the expression.
i is an imaginary number - it's not on the number line and it never will be; which means any TERM with i in it, is imaginary. 6i is one term so the entire term is imaginary since 6i will never be on the number line.
2 is on the number line which means it's a real number.
i hope this helps!