Question

Need the answer to this:
Evaluate the function in the picture for X=-1 and X=9.

Possible Answers:
A. f(-1)=11, f(9)=-14
B. f(-1)=-1, f(9)=9
C. f(-1)=5, f(9)=6
D. f(-1)+11, f(9)=1

Answer 1

what is f(-1) ? What is f(9) ?

Answer 2

look at the picture

Answer 3

yes, look at it and answer my question. What is f(-1) and what is f(9) ?

Answer 4

idk i gave u all the info i was given.

Answer 5

I'm trying to say that you can answer this, rather than me just give you the answer without you understanding any of it...

Answer 6

i posted the picture at the top if that helps

Answer 7

and I will help you to answer it if you want. But I'm not going to look at it and do all the work for you.

Answer 8

This is work that's been assigned to you, so you should be able to work this out. I'll help you work it out if you're a bit unsure, but I won't just do it for you.

So the most basic starting point, that *you* should be thinking about, is, "what is f(-1)?" Do you know how to go about working that out?

Answer 9

How does one figure that out?

Answer 10

You go to the definition of the function, which is given in the picture you linked to.

Answer 11

There are three possible values for the function: 11, -14, 1. Which one of those it takes depends on if it satisfies the condition to the right of that number.

So you need to take your value of x, ( -1 ), and see which of the conditions on the right is satisfied by x=-1.

Answer 12

and?

Answer 13

ok

Answer 14

So what is f(-1) ?

Answer 15

what do u mean by satisfied?

Answer 16

would it be 11? because -1 </=5?

Answer 17

I mean, if you substitute the value of x into one of the conditions on the right, then that condition is true.

For example the condition could be x < 1. If x = 0, then x satisfies that condition. if x = 2, then x does not satisfy the condition.

Answer 18

yes. f(-1) = 11 because -1 <= 5.

Answer 19

Now you can work out f(9), and then you can answer the question and actually understand why you got that result. So then if you have a test or something you might actually know what you're doing.