Question

Select one of the factors of x3 + 3x2 + 7x + 21.

Answer 1

(x^2+7)(x+3)

Answer 2

hello joe i have a question

Answer 3

Using the rational roots theorem, if you have a rational root, it must be a divisor of 21.
Then by inspection, -3 would be one of those roots.

Answer 4

yes satellite?

Answer 5

is there some general disagreement that i don't know about that says arcsine, arccosine etc are not functions and can have more than one value?

Answer 6

We force them to be functions by limiting their range.

Answer 7

that is what i thought but look here
http://openstudy.com/groups/mathematics?version=feed:get-live-help&referrer=mathematics&domain=tutorial.math.lamar.edu#/groups/mathematics/updates/4e4430d30b8b3609c71e6c8b

Answer 8

if you dont limit the range, then i guess they wouldnt be functions.

Answer 9

to me a function is a function. one input, one output. but look at this question. it seems to suggest that arccsc is not a function. at first i just said the last one because it was the only one with one number, but it is wrong

Answer 10

and then i thought "another idiot math teacher" but she says it is an on line quiz

Answer 11

the question is just worded poorly. If it wants multiple answers, it should be phrased like:
"What angles give csc(theta) a value of sqrt(2), theta from 0 to 2pi?"

Answer 12

it also depends on how the teacher is defining the functions. Most ive seen will limit the range (which is proper), but ive seen a few cases where they dont.

Answer 13

well fine but that is not what it says. it does not say "find a formula for all numbers whose cosecant is whatever. it says "find cosecant of something"
i feel another rant coming on so i will go watch judge judy and chill out

Answer 14

just thought i would ask you in case i was losing my mind again

Answer 15

LOL, yeah, it isnt the correct way of doing things. But these kids are in Rome. And when in Rome, do as the Romans do.