Answer:
p²-100q²
Explanation:
p(p+10q)-10q(p+10q)
p·p+p(10q)-10q(p+10q)
p·p+p(10q)-10qp-10q(10q)
p·p+10pq-10pq-10q(10q)
p·p+0-10q(10q)
p·p-10q(10q)
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