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

A 2

C 12

D 1

Solution

Correct Answer: Option A

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

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