x+2y = 4 এবং xy = 2 হয়, তবে x=?
Correct Answer: Option D
xy=2 then y=2/x
so, x+2y=4
=> x+2× 2/x=4
=> x + 4/x=4
=> (x2+4)/x=4
=> x2+4=4x
=> x2-4x+4=0
=> x2-2x-2x+4=0
=> x(x-2)-2(x-2)=0
=> (x-2)(x-2)=0
=> x = 2
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