x+2y = 4 এবং xy = 2 হয়। তবে x = কত?

A

B ১২

C

D

Solution

Correct Answer: Option D

দেওয়া আছে,
x+2y = 4
=> x = 4-2y

এখন,
xy = 2
=> (4-2y)y = 2
=> 4y-2y= 2
=> 2y2-4y+2 = 0
=> y2-2y+1 = 0
=> (y-1)2 = 0
=> y = 1

x = 4-2y সমীকরণে y এর মান বসিয়ে পাই, x = 4-2y
=> x = 4-2*1
=> x = 2

সুতরাং, x = 2

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