what is k(p)= (p+3)(p-7)

Answer 1

FOIL

First: p^2
Outer: -7p
Inner:3p
last: -21

add them: k(p)=p^2-4p-21

Answer 2

(p+3)*(p-7)=p*p+p*3-7*p-7*3
=p^2+3p-7p-21
=p^2-4p-21

k(p)=p^2-4p-21

Answer 3

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