Question

PLEASE HELP

Answer 1

What's the problem? :)

Answer 2

Marta is trying to find a function. She knows that f(–2) = 0, f(1) = 9, and f(4) = 0. Which function is Marta looking for?

A. f(x)=x^2-2x-8

B.f(x)=-2x^2+x+4

C.-x^2+2x+8

D.f(x)-9x^2-2x+4

Answer 3

C

Answer 4

can you explain how you got tht im lost

Answer 5

C, because you enter the numbers in for x in f(x).

Answer 6

Then, if you do the work you come out with -x^2+2x+8.

Answer 7

@Katieann16
assume function to be ax^2+bx+c
then f(-2)=?

Answer 8

Just substitute in 1 for all of them - since the answer must be 9, and C is the only equation that gives that.

Answer 9

just put x=-2 in this equation:)
@Katieann16 i m telling u the general method:)

Answer 10

so.. -x^2+2x+8
-2^2+2(-2)+8
=0?

Answer 11

Yes^^ Exactly! That's how all f(x) problems should work out, if not then you have to re check your work! :-)

Answer 12

thank you(:

Answer 13

@Katieann16 u r putting in equation but it will work if u r trying hit and trial but if their re no options or more than 10 then what will u do
general method is to assume an equation like
now put x=-2 :)