If x2+4y2 = 4xy, then x:y is- (যদি x2 + 4y2 = 4xy হয়; x:y এর মান কত ?)

A 1:1

B 1:2

C 2:1

D 1:4

Solution

Correct Answer: Option C

দেওয়া আছে, x2 + 4y2  = 4xy 
          => x- 4xy + 4y = 0
          => x2  - 2.x.2y + (2y)2  = 0 
          => (x - 2y)2  = 0     [ a2  - 2ab + b2  = (a - b)2  ] 
          => x - 2y = 0 
          => x = 2y 
          => x/y = 2 
     x : y = 2 : 1 

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