K kpx001 Junior Member Joined Mar 6, 2006 Messages 119 Sep 15, 2008 #1 how would i approach this problem x^3 * (x^2+1)^(1/2) u sub and then x sub doesnt work. is it legal to do u = x^2 + 1 then (u-1)^(3/2) = (x^2)^(3/2) ?
how would i approach this problem x^3 * (x^2+1)^(1/2) u sub and then x sub doesnt work. is it legal to do u = x^2 + 1 then (u-1)^(3/2) = (x^2)^(3/2) ?
D Deleted member 4993 Guest Sep 15, 2008 #2 kpx001 said: how would i approach this problem x^3 * (x^2+1)^(1/2) Try \(\displaystyle x \, = \, \tan\theta\) u sub and then x sub doesnt work. is it legal to do u = x^2 + 1 then (u-1)^(3/2) = (x^2)^(3/2) ? Click to expand...
kpx001 said: how would i approach this problem x^3 * (x^2+1)^(1/2) Try \(\displaystyle x \, = \, \tan\theta\) u sub and then x sub doesnt work. is it legal to do u = x^2 + 1 then (u-1)^(3/2) = (x^2)^(3/2) ? Click to expand...
