Question

what is the function evaluated at f(4)=x-4/(x^2)-16?

Answer 1

just put 4 instead x

Answer 2

i know man im trying to get a point across that i dont understand

Answer 3

everyones telling me its undefined. but in reality its 0/0 which is just zero.

Answer 4

i wanna say im right, but the graphing calculator shows error for f(4)

Answer 5

\[\frac{x-4}{x^2}-16\] is it like this?

Answer 6

or this?
\[\frac{x-4}{x^2-16}\]

Answer 7

no the denominator is x^2-16

Answer 8

yes. sorry it is the second one

Answer 9

yeah it's undefined, because you can't divide by 0

Answer 10

but hold up

Answer 11

zero

Answer 12

marios right isnt he?

Answer 13

hes wrong

Answer 14

evaluated that makes 0/0

Answer 15

4-(4) is zero

Answer 16

please explain tomas

Answer 17

yeah you can't divide by 0

Answer 18

you cant divide a zero by zero?

Answer 19

you can't divide anything by zero and especially zero by zero

Answer 20

i dont comprehend that

Answer 21

i understand anything (besides zero) divided by zero is undefined, but if you type \[0\div0\] you get 0

Answer 22

no you can't divide by zero :D

Answer 23

really?

Answer 24

really

Answer 25

im thinking way to fluttering hard about this.. im a precalc student

Answer 26

my calc gives me an error when i divide zero by zero

Answer 27

^ just realized this

Answer 28

ok tomas 1 more thing

Answer 29

im taking precalc next semester btw

Answer 30

what grade are you? hondaman?

Answer 31

i just simplified that function and i got \[1divx+4\]

Answer 32

im in college, precalc

Answer 33

when you simplify function you must state that \(x^2-16\neq0\) and solve it

Answer 34

i guess your right? i just went right to plugging pellet in and seeing 0/0 which looked pretty real

Answer 35

any reason why that first function graphed looks differnt from its simplified function x/(x+4)?

Answer 36

you mean 1/(x+4)? and you can't simplify functions like that

Answer 37

you can't simplify x, because you don't know value of x

Answer 38

yes. that being the simplified form of my original function

Answer 39

you can simplify only numbers

Answer 40

but i was just simplifying a rational expression

Answer 41

ok you can simplify when it's just rational expression

Answer 42

but not when its a function?

Answer 43

yes, because you change function, you eliminate one of variables x

Answer 44

guess that makes sense