The value of the integral 24 5 24 dx1 + [3] 2x is :
- 3
- 18
- 6
- 12
Answer
(4) 12
Solution
I = /245 /24 dx1 + [3] 2x
Use ab f(x) dx = ab f(a + b - x) dx with a + b = 4:
2 ( 4 - x ) = 2x
I = /245 /24 dx1 + [3] 2x = /245 /24 [3] 2x [3] 2x + 1 dx
Adding: 2I = /245 /24 1 dx = 5 24 - 24 = 6
I = 12
Answer: (4)