Question

i need help finding where i made i mistake while solving this problem

Answer 1

what problem

Answer 2

whats the problem

Answer 3

sorry it didnt upload the first time

Answer 4

fx is (x)*sqrt(x^2+y^2)
and fy is (x)*sqrt(x^2+y^2)

Answer 5

so if you place the appropriate derivatives in sqrt(1+fx^2+fy^2)
ans simplify you get sqrt(2) and if you solve this your limits are 0<r<2 and 0<theta<2pi
which gives you an answer of 4pisqrt(2)

Answer 6

how is this wrong...whered i make my mistake?

Answer 7

@hartnn

Answer 8

the correct answer is 4π(2−2sqrt(2)) i dont know why though

Answer 9

i don't know much, but how come your fx and fy both are same ?

Answer 10

fy is (y)*sqrt(x^2+y^2) sorry i meant this

Answer 11

simplifying, u still getting sqrt2 ?

Answer 12

yea=(

Answer 13

that was jus a typo

Answer 14

ohh... i think the portion of sphere is asked, hence u subtract that from 4*pi*r....maybe...

Answer 15

but the surface area of a sphere is 4*pi*r^2