যদি x + 2y = 4 এবং xy = 2 হয়, তবে x = কত?

A

B

C ১২

D

Solution

Correct Answer: Option A

xy=2
বা , y =2/x
x+2.2/x=4
x²  +4 =4x
x² -4x +4 =0
(x-2)²  =0
∴ x =2

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