whole root of a+b divide by whole root of a-b find the rationalization of Denomater
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Here is your answer
First multiply the root number
(va -vb) (Vat vb)
==>
(Vava vab +vab - Vbvb
==>
(Va^2 - vb^2)
==>
(a-b)
Now
(a-b) (a-b) (a^2+b^2)
==>
(a-b)^2 (a^2 +b^2)
Hope it's helpful
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