Question 415706
"Foil" is a mnemonic meaning "first, outer, inner, last." For example, if we have a product in the form (a+b)(c+d), we would multiply the first terms (a, c), followed by the outer terms (a, d), followed by the inner terms (b, c), finally the last terms (b, d). Adding them together, this becomes


ac + ad + bc + bd.


Try that for your problem.