kenny lam's answer to Jovan Dwiputra's Secondary 2 Maths question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
kenny lam
Kenny Lam's answer
8 answers (Tutor Details)
1st
Use the "F.O.I.L" method multiply the First two digits, Outer two, Inner two then the Last two.

After that simplify thus ending up with that.

Hope this helps!:)