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Question

If the values of a+b and ab are 12 and 32 respectively, find the values of a2+b2 and (ab)2

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Solution

(a+b)2=a2+b2+2ab
144=a2+b2+2(32)
a2+b2=80
(ab)2=(a+b)24ab
ab=144128
ab=±4

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