Question

Find abs extrema

Answer 1

\[f(x)=\frac{ 4 }{ x^2+1 }\]

Answer 2

interval is [-1,3]

Answer 3

find the derivative

Answer 4

I would use quotient rule and then find the critical numbers right?

Answer 5

yes

Answer 6

for my derivative I got x^2+1-8x over (x^2+1)^2

Answer 7

no

Answer 8

oh wait would it be -8x on top?

Answer 9

yes

Answer 10

so my critical number is zero?

Answer 11

yes

Answer 12

then my abs max is (0,4) and my abs min is (3,2/5)?

Answer 13

yes

Answer 14

oh you are my man! thanks for stopping by! and btw why does it take a while for people to answer my questions now?

Answer 15

depends on who is online

Answer 16

When I first used this site around 3 years ago, I got help in about 5-10 mins

Answer 17

quite a few people that help are also college students and this time of year is really busy for them too.

Answer 18

ahh that makes sense, well thanks for answering my questions!

Answer 19

no problem