math

what is it mean to "foil" in math

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  1. 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"

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    f(x+1)=8x^2+x-3 f(-x)=8x^2+x-3 work: #1 8(x+1)(x+1)+x-3 then FOIL 8(x^2+x+x+2)+x-3 8x^2+16x+16+x-3 *8x^2+17x+13 #2 8(-x)^2-x-3 8x-x-3 *7x-3 I know on the first one you FOIL but im still getting it wrong?? The second one i thought

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