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Question

Prove that
(2.5p1.5q)2(1.5p2.5q)2

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Solution

(2.5p1.5q)2(1.5p2.5q)2

=(2.5p)22(2.5p)(1.5q)+(1.5q)2[(1.5p)22(1.5p)(2.5q)+(2.5q)2][(ab)2=a22ab+b2]

=6.25p27.5pq+2.25q2[2.25p27.5pq+6.25q2]

=6.25p27.5pq+2.25q22.25p2+7.5pq6.25q2]

=4p24q2

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