- #1

bmed90

- 99

- 0

so Work = the integral from [0,9] of 10/(1+x)^2(dx) U substitution gives

u=1+x

du=dx

the 10 is factored out tilll the end.

Ok so, in this example at x=0, U=1 and at x=9, U=10

Now the new limits are [1,10] instead if [0,9]. But Why?