Question

Find f(-2) if f(x)=-x^3+2x^2+x-1

Answer 1

just plug in the value -2 wherever you see x

Answer 2

\[f(x) = -2^3 + (2*-2^2) -2 - 1\]

Answer 3

just a mistake -x^3

Answer 4

-13 ?

Answer 5

f(-2)=-(-2)^3+2(-2)^2+(-2)-1
f(-2) = 2^3 + 2(-2)^2 -2 -1
f(-2) = 8 + 16 - 3
f(-2) = 24 - 3
f(-2) = ? subract 3 from 24 t get your answer

Answer 6

let me know if something doesnt make sense

Answer 7

13 was the correct answer

Answer 8

yup 13

Answer 9

true or false f(x)=3/x+7x^2 is a polynomial

Answer 10

what do you think?

Answer 11

true

Answer 12

why?

Answer 13

i dont know

Answer 14

do you know what polynomial means?

Answer 15

yes an expression of more than two algebraic terms

Answer 16

yes an expression of more than two algebraic terms

Answer 17

polynomial means many terms

"poly" meaning "many", "nomial" means term. Those terms can consist of, constant or variables or exponents

but in this equation there is a problem look down in this picture that I attached

Answer 18

ok then it is false

Answer 19

can you give the reasoning?

Answer 20

yes becasue the dividing in the problem

Answer 21

correct
3/x cannot be considered as a term so it's no longer 'poly'nomial

Answer 22

State the degree:rst+r^2s^2+r^3s^2 can you help me with this

Answer 23

degree in this simply means the largest exponent of a particular variable
\[r^2 + s^2 + r^3s^2\]

Answer 24

ok its 5

Answer 25

@what!? sorry I did notice the -x^3 later, after I posted, didn't feel like re-writing it.

Answer 26

no
you have to state for each variable separately

Answer 27

is rst considered part of the equation in this?

Answer 28

yes

Answer 29

alright.

state the variables first then.