Verified Answer :

ZhiHeng

(3p - 7)(3p + 7) =
(3p × 3p) + (3p × 7) + (-7 × 3p) + (-7 × 7) =
9p^2 + 21p - 21p - 49
= 9p^2 - 49

Therefore, answer would be D.

Answer:

Step-by-step explanation:

to multiply the two factors we can use the concept of FOIL

so when we multiply the (3p – 7)(3p + 7)

we get

\((3p -7)(3p + 7) = 3p.3p+3p.7-3p.7-7.7\)

\(9p^2-21p+21p-49\) (cancel the 21p)

\(9p^2-49\)

correct option is D.

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