The area of the region R= \(x, y) : xy 27, 1 y x2 \ is equal to :
- 78 e 3- 523
- 54 e 3- 523
- 54 e 3- 263
- 54 e 3+ 263
Answer
(2) 54 e 3- 523
Solution
[figure]
(The bounded region lies in the first quadrant, x>0.)
y=x2 and xy=27 meet at x3=27 (3, 9)
y=1 meets y=x2 at x=1 and xy=27 at x=27
Area = 13 (x2-1 )dx+ 327 ( 27x-1 )dx
= [ x33-x ]13+ [27 e x-x ]327
= (6+ 23 )+ (27 e 9-24 )
=54 e 3- 523
Answer: (2)