x2+y2=xy হলে (x+y)4 এর মান কত?

A x2y2

B xy

C (x2+y2)2

D 9x2y2

Solution

Correct Answer: Option D

    x2+y2=xy 

=>(x+y)^2 - 2xy = xy 

=> (x+y)^2 = 2xy + xy = 3xy 

=> {(x+y)^2}^2 = (3xy)^2 

=> (x+y)^4 = 9x2y

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