Question

Partial Derivative: sqrt[21]{x^{21}+y ^{21}} at Fx(0,0)

Answer 1

wrt what?

Answer 2

can u write that out in the equation

Answer 3

easier to see what u want

Answer 4

k so my answer is
\[x^{21}/(x^{21}+y^{21})^{21}\]

Answer 5

here ill repost

Answer 6

what is the question tho.

Answer 7

Find the partial derivative with respect to x at (0,0) --- \[\sqrt[21]{x^{21}+y ^{21}}\]

Answer 8

i got the derivative, but when i plug in the 0,0... it comes out to 0, which for some reason the online program we use didn't accept

Answer 9

guessing it's because there will be a 0 in the denominator.... so it should be "does not exist"???

Answer 10

oh ok
so it is (1/21)(x^21+y^21)^(1/20) * (21x^20)

Answer 11

there are no fractions involved?....

Answer 12

no fractions involved. the fraction one that i posted was the answer i got

Answer 13

ya but your answer is wrong

Answer 14

?? checked it with mathematica

Answer 15

o right... entered it into open study wrong. answer should be \[x^{20}/(x^{21}+y^{21})^{20/21}\]

Answer 16

oops i made a typo... answer is:
(1/21)(x^21+y^21)^(1/20) * (21x^20)

which reduces to what u just wrote now yes

Answer 17

so the solution at (0,0) is undefined.

Answer 18

ah ok thank you very much

Answer 19

does not exist...

Answer 20

slkdfjsalkdfjsldj wtf.... the online program says Does not exist is the wrong answer

Answer 21

grrrr welp out of tries to enter the answer in

Answer 22

undefined didn't work either

Answer 23

well its undefined...so either ur program is wrong or its just asking for something verbally equivalent to saying undefined

Answer 24

dne

Answer 25

try that

Answer 26

tried 0, dne, and undefined. none of them worked

Answer 27

well ur program is wrong cuz thats the answer

Answer 28

hrm gonna have to talk to the teacher

Answer 29

alright well thanks for the help