How do you multiply #(-d + 4)(-d - 4)#?

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Answer 1 · 2018-03-02T04:15:18

USE FOIL

F- first terms meaning multiply #-d * -d = d^2#

O- outside meaning #-d * -4=4d#

I- inside meaning #4*-d=-4d#

& finally

L - last meaning #4 * -4= -16#

Now add all answers #d^2 + 4d + -4d +-16#

Which gives #d^2 -16#

ANS = #d^2-16#