Question

will medal :} help
Which function matches the table?
A)ƒ(x) = x + 1
B)ƒ(x) = 1
C)ƒ(x) = x2
D)ƒ(x) = x - 1

Answer 1

X | f(x)
0 | 1
2 | 3
3 | 4
4 | 5
5 | 6
6 | 7

Answer 2

check which function gives f(x). example x=0 ,f(x)=1 so which function gives 1? then check the next

Answer 3

i think it's D

Answer 4

@Harindu

Answer 5

lets take a look at D. If you use f(x) = x-1 and plug values in...

start with 0. the table tells you that when x=0, f(x) = 1
using equation D, f(0) = 0-1 = -1.

They don't match up so it can't be D!

Answer 6

no your answer is wrong. the function D is f(x)= x-1 so if x=0, f(x) =0-1=-1 which doesn't correspond with the given example

Answer 7

so when i do A it comes out x=1/f-1
b x=1/f
c x=^x2/f

i believe A comes to the best choice.

Answer 8

@LifeEngineer

Answer 9

sorry, I'm not following your work. When did you divide by f?

Answer 10

But you are correct, A is the right answer.

Just to recap, B is a constant function. f(x) = 1 is saying that no matter what x is, the function = 1. We know thats not true by looking at every entry but the first in the table.

C is saying square your x (unless its 2*x.. either way its wrong)
plug in x = 2, x^2 = 4, not 3 so C doesn't work either