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Question
Factorise the following:
p4 + 23p2q2 + 90q4
Sum
Solution
P4 + 23p2q2 + 90q4
= p4 + 18p2q2 + 52q2 + 90q4
= p2(p2 + 18q2) + 5q2(p2 + 18q2)
= (p2 + 18q2)(p2 + 5q2).
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