## anonymous one year ago please help :) these polynomials? A. f(x)=3x+(4/3)x^3-7 B. g(x)= -5x^3+x-3/x C. h(x)= x^3sqrt5+x-3 D. k(x)= 25x^2-x^3+x^5

1. anonymous

2. blackstreet23

a polynomial is any variable with a positive exponent

3. blackstreet23

$3x^5$ is a polinomial

4. anonymous

I got no for that bc of the fraction but im not sure haha

5. blackstreet23

$3\sqrt{x}$ or $3x^(1/2)$ are not polinomials

6. blackstreet23

i am sorry, not just positive exponent, the exponent has to be a positive integer

7. blackstreet23

so the previous ones are not polinomials

8. anonymous

so is 2 yes 3 and 4 no and 5 yes?

9. blackstreet23

give me a sec

10. blackstreet23

2 is yes

11. blackstreet23

3 is no because $3/x$ is the same as $3x^(-1)$

12. blackstreet23

4 is yes

13. anonymous

why is 4 yes?

14. blackstreet23

because whatever the coeficients are does not really matters

15. blackstreet23

we just care about the variables having positive integers

16. blackstreet23

get it?

17. blackstreet23

and finally 5 is yes

18. anonymous

okay i get it! thank you :)

19. blackstreet23

for the same reason

20. blackstreet23

no problem :)