x2+y2=xy হলে (x+y)4 এর মান কত?
A x2y2
B xy
C (x2+y2)2
D 9x2y2
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 = 9x2y2
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