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= 3p(3p) + 3p(q) + 3p(3p) + 3p(q) + 3p(3p) + 3p(q) + q(3p) + q(q) + q(3p) + q(q) + q(3p)
= 3p² + 3pq + 3p² + 3pq + 3p² + 3pq + 3pq + q² + 3pq + q² + 3pq
= 9p² + 18pq + 2q²