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Question

Show that :
(2x7y)2+28xy=4x2+49y2

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Solution

L.H.S
(2x7y)2+28xy
=4x2+49y22×2×7xy+28xy [(ab)2=a2+b22ab]
=4x2+49y228xy+28xy
=4x2+49y2
=R.H.S
Hence proved.

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