can someone help me solve
integral from 0 to 4 of
(x)/ (square root of x^2+9) dx
No, that's not quite correct, you should have
Finding the anti-derivative is the main problem, you have two choices as regards the limits of the integral: you can transform the limits along with the integrand:what do i do with the 0 to 4 part?
or you can do a back-substitution before you apply the old limits: