Asked by kitty
what is it mean to "foil" in math
Answers
Answered by
Reiny
suppose you have
(a+b)(c+d)
= ac + ad + bc + bd
ac is the product of the "firsts" --- f
ad is the product of the "outers" --o
bc is the product of the "inners" ---i
bd is the product of the "lasts" ----l
hence "foil"
(a+b)(c+d)
= ac + ad + bc + bd
ac is the product of the "firsts" --- f
ad is the product of the "outers" --o
bc is the product of the "inners" ---i
bd is the product of the "lasts" ----l
hence "foil"
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