
Christian C. answered 09/15/20
Mathematics and C++ tutoring services
This statement is true! when using U substitution you have to adjust the bounds of the integral with respect to u.
Let u =x+1
The bounds must be adjusted to respect u hence,
u(5)=5+1=6, u(3)=u+1-4
therefore
5 6
∫1/(x+1)dx = ∫ 1/u du
3 4