Question

Which of the following is NOT a zero of the polynomial shown below?

f(x)=2x^4-x^3-42x^2+16x+160

A. 2.5
B. 1
C. -4
D. -2

Answer 1

@tkhunny last one help me please

Answer 2

this ain't him but I'm good.

Answer 3

c

Answer 4

you sure? (:

Answer 5

yes.

Answer 6

thanks so much!!!! :D

Answer 7

ur welcome.

Answer 8

Are we sure about that??
Lets test it

2x^4-x^3-42x^2+16x+160 = 0
2(-4)^4-(-4)^3-42(-4)^2+16(-4)+160
2(256) - (-64) - 42(16) -64 + 160
512 + 64 - 672 - 64 + 160
576 - 672 - 64 + 160
-96 - 64 + 160
-160 + 160
0

C is incorrect

Answer 9

wow i knew it !! @BPking wrong!!

Answer 10

@StudentLearner Never accept answers without doing it out yourself

Answer 11

:/

Answer 12

thanks but i already got it wrong on my test.

Answer 13

NO IT IS

Answer 14

Alright, that will be a lesson enough...

Regardless....you can guess and check the answers (as I showed above) or you can factor this equation out and see

Answer 15

it said wrong.. i got a B it said your answer was wrong @BPking

Answer 16

Thanks for the advice @johnweldon1993

Answer 17

@BPking I showed it above...it is a zero of the function..the question asks for the choice that is NOT a zero

Answer 18

ooohhh.

Answer 19

my mistake