Question

n^3+n+1 is a prime?

Answer 1

my options are
1
2
3
4

Answer 2

Just plug those numbers in for n and see which one is a prime.

Answer 3

for 1 i get 3
for 2 i get 11
for 3 i get 31
for 4 i get 69

Answer 4

i think 1,2,3 are all prime but not 4., obviously by substitution we can get that

Answer 5

Is there more than 1 option?

Answer 6

2 is not prime.

Answer 7

so then whats my answer i can only choose on of them

Answer 8

its not b or c

Answer 9

Plugging in 3 does not give you 31.

Answer 10

are you sure you phrased the *whole* question exactly correctly?

Answer 11

Exactly precisely correctly

Answer 12

would it be a?

Answer 13

@Jhannybean plugging in 3 does give you 31.

@susana123 1,2,3 all give primes so it is all of them

Answer 14

what is the exact question? I understand the expression, but the question verbatim is what?

Answer 15

but i can only choose one its multiple choice

Answer 16

Which of the following is a counterexample for the given statement.

Answer 17

hellooooooooooo can you write the exact question please? in English?

Answer 18

@susana123 Then I sugest you go yell at your teacher.

Answer 19

oh a *counterexacmple* you say?

Answer 20

yes

Answer 21

then Given then we have determined which are prime, you can take it from here

Answer 22

Nobody else give the answer please

Answer 23

That would change it... it would be 4 in that case. because it shows that not all values of n can be used with that equation to find a prime.

Answer 24

i already know its not b or c

Answer 25

Thank you!

Answer 26

@susana123 we just spent some time showing for which values of n the expression is prime, so you should be able to see the one we left out.
Welcome!

Answer 27

BTW, here a homework problem for you, try and find a equation that will find every prime. If you do it im sure your teacher will give extra credit. :D

Answer 28

lol ok thanx(: