x + y = 12 ও  x – y = 2 হলে, xy এর মান কত?    

A    25

B    30

C    35

D    45

Solution

Correct Answer: Option C

 

Sol: x + y = 12 x – y = 2 2x = 14 X = 7 Now, 7 + y = 12 Y = 12 – 7 = 5 Then, x*y = 7*5 = 35 OR  4xy = (x+y)^2 - (x-y)^2

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