i absolutely LOVE derivatives. i CANNOT figure this one out. i have major trouble with square roots. >,<!!

f(x)= 1/√(x+2),, so find f'(a)

yeah. i know. simple right? i just can't figure out. i know its ^1/2 for the sqrt, but blehhhhh! i've tried this one a million times!

i know the answer is -1/2(a+2)^3/2, back of the book. but erggg >.<

well, while we're at it-->this one too?! just a simple derivation. it's just, "whaaa? why is THAT not right?" lol