factorise : p4 + 9p2q2 + 81q4
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Step-by-step explanation:
p4+9p2q2+81q4 = p4+18p2q2+(9q2)2-9p2q2
= (p2+9q2)2 - (3pq)2
=(p2-3pq+9q2)(p2+3pq+9q2)
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