Question

(ii) Prove that, (x2 + 2xy - y2), (x2 + y2)2 and (x2 - 2xy - y2)2 are in A.P
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Answer 1

Answer:

I think the question should be:

Prove that (x^2 + 2xy - y^2)^2, (x^2 + y^2)^2 and (x^2 - 2xy - y^2)^2 are in AP

In which case it's easily proven by checking if difference between 2nd and 1st term & 3rd and 2nd term are equal or not