Another math question... help!

if u^2 = 2x+5 then u = (2x+5)^(½). Then just use chain rule.

well i tried that but i couldn’t reach the right part which is 2u(du/dx)=2, this is the stage i want to reach….

Hmm, I’m not sure that that result it right. It looks like you tried to do an implicit derivative, but there’s an error.

Implicit differentiation is when you take the derivative of an an equation when it’s not in the form y = f(x). That is the case with your function up there. But when you do that for this function, you should get a slightly different answer than what you wrote. Furthermore, I’m not sure that implicit differentiation is the right way to go about a u substitution.

Either way should work. Silverangel, all you need to do is put (du/dx) on one side of your equation, and everything else on the other, then plug in for u like Mariah suggested in her first response.