Hi guys, i've got this exercise which requires me to calculate the first three terms of the Maclaurin seris for the sqr root of

My attempt gives me ( i don't know the code for the sqr root symbol so i've left it out but there should be the sqr root symbol on every term of the series:

If anything is wrong i would greatly appreciate it, if you point out and feel free to make corrections.

Thanks a bunch.