Question

http://prntscr.com/an22jv

Answer 1

thts totally wrong :)) give another try

Answer 2

\[(a + b + c)(d + e)\]
\[a(d+e) + b(d+e)+c(d+e)\]

Answer 3

If you haven't already, draw out the box method for this

Answer 4

@rishavraj has a valid alternative, but it's easy to lose track of terms. In my opinion anyway. It's handy to know both methods though