lower boundary = 0

upper boundary = 4

x / (sqrt 1 + 2x)

I've let u = 1 + 2x

du = xdx

new boundaries = 1 to 9

u^-1/2 du. If I integrate it, it will 2u^1/2

2(9)^1/2 - 2(1)^1/2 = 4

This is what I keep getting but apparently it's wrong.....I'm not understanding how else to do this problem (Wondering). The answer should be 10/3