Question

Given f(2) = 12, which of the following could be an equation of the function?






A.


f(x) = 8x – 2




B.


f(x) = 4x + 4




C.


f(x) = 6x – 4




D.


f(x) = –4x – 4

Answer 1

Substitute x as 2 in every option and check it comes to 12

Answer 2

f(2) = 12 means that when x = 2, the value of the function is 12.

So go through each choice and see if when x = 2, the function has a value of 12.

Answer 3

whats the answer @Easyaspi314

Answer 4

U try it first

Answer 5

i dont know this

Answer 6

Let's try choice A to see if that works.

f(x) = 8x - 2

Substitute x = 2, we get 8(2) - 2 = 16 - 2 = 14. No good.

We want that when x = 2, f has a value of 12.

So you try the remaining choices and determine which one is correct.

Answer 7

C ? @Easyaspi314

Answer 8

why do u think so?

Answer 9

C? 6x - 4?

Let's see. when x = 2, 6x - 4 = 6(2) - 4 = 12 - 4 = 8. No good.

Answer 10

D ? @Easyaspi314

Answer 11

Show me why you think D is correct.

Answer 12

i dont knwo thats just my best answer? @Easyaspi314

Answer 13

Not good enough. All what you have to do is to substitute x = 2 into that expression. Can you do that?

Answer 14

is im right? @Easyaspi314

Answer 15

@lad7

I assume you are here to learn, and not just to get answers.
If you think D is correct, what work did you do to get choice D?