(3p - 3q + r)(3p - q - 3r)
(6p - 3q - 3r)(3p - q - 4r)
(3p - q + 3r)(3p + q - 3r)
(3q - p + 3r)(3q - p + 3r)
Correct answer is C
9p2−q2+6qr−9r2
= 9p2−(q2−6qr+9r2)
= 9p2−(q2−3qr−3qr+9r2)
= 9p2−(q(q−3r)−3r(q−3r))
= 9p2−(q−3r)2
= (3p+(q−3r))(3p−(q−3r))
= (3p+q−3r)(3p−q+3r)
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