hey there

I can't get this problem I've been trying it for a while now and it is really frustrating me...some help would be greatly appreciated

integral of 5 / sqrt (48-16x-64x^2) dx

I tried completing the square by getting 49-64(x+1/8)^2...is this right? I've seen so many ways to complete the square I don't know which I should use for integrals...

and then I went ahead and tried to solve it by trig substitution but I just can't get it :S I used u= 7sint

thanking you in advance