The area of the region bounded by the curves x+3y2=0 and x+4y2=1 is equal to :
- 13
- 23
- 43
- 53
Answer
(3) 43
Solution
[figure]
Intersection: -3y2=1-4y2 y2=1 y= 1, points (-3, 1)
For -1 y 1: left boundary x=-3y2, right boundary x=1-4y2
Area = -11 [ (1-4y2 )- (-3y2 ) ]dy
= -11 (1-y2 )dy=2 [y- y33 ]01=2 23= 43
Answer: (3)