Question

82. If x2 + 4y2 = 4xy, then x: y =?
(A) 2:1
(B) 1:2
(C) 3:2
(D) 1:4​

Answer 1

82. If x2 + 4y2 = 4xy, then x: y =?

(B) 1:2

Answer 2

Answer:

(A) 2 : 1

Explanation:

$x^2+4y^2=4xy$

$x^2 -4xy+(2y)^2=0$

$(x-2y)^2=0$

x - 2y = 0

x = 2y

x/y = 2/1

Thus x : y = 2 : 1

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