Check my asnwer... MEDAL!!!

If x = −4 is a zero of the polynomial function f(x) = 2x3 + 13x2 + 23x + 12, which of the following is another zero of f(x)?

x = 4
x = −1
x = 1
x = 12

My answer is A. x=4

Question

Check my asnwer... MEDAL!!!

If x = −4 is a zero of the polynomial function f(x) = 2x3 + 13x2 + 23x + 12, which of the following is another zero of f(x)?

x = 4
	x = −1
	x = 1
	x = 12

My answer is A. x=4

superdavesuper · Answer

A zero of the polynomial function means f(A)=0
the Q says f(-4)=0
but is f(4) equal to zero too?
if not, then x=4 is not a zero.

agl202 · Answer

So, A isn't correct?

pawanyadav · Answer

No ,

superdavesuper · Answer

f(4) is not equal to 0 so A is not correct :)

agl202 · Answer

K

superdavesuper · Answer

test other choice to see if f(_)=0 perhaps?

pawanyadav · Answer

Easy method:-
As all term are positive but you have to cancelled them all to get 0
So you have to put some negative value
And therethere is only one negative
and that is -1