This is what I did:

u=sq. x

2du=1/2sq.x dx

2 int. 1 to 4 ue to the u du

then integration by parts:

y=u

dv=e to the u dy

du=u2/2

v=e to the u

=ue to the u-2 int. 1 to 4 e to the uu2/2

=ue to the u-2|u2eu-eu2u (1 to 4)

=ue to the u-16e4-6e (after I pluged in 4 and 1)

Can someone please show me what I did wrong?

Thank you