Source: Official Guide Revised GRE 1st Ed. Part 6; Set 2; #7

7

The figure above shows the graph of the

The figure above shows the graph of the function f in the xy-plane. What is the value of f (f(?1))? ?2, ?1, 0, 1, 2

3 Explanations

2

Rovshan Danilov

how does one discern that (-1) is an x coordinate?

Mar 5, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Hi Rovshan :)

Typically functions are written in the form f(x). With that in mind, in this question, the x of f(x) has been replaced with (-1). That's how we know that we are solving for the value of the expression when x=-1.

I hope this clears things up :)

Mar 7, 2016 • Reply

6

Yosef Lewis

The notation can be confusing here. We can think of this problem sort of like an order of operations problem. First solve the function inside the parentheses. This gives us a new value. Then we can solve the new function. Don't brush over too impetuously, thinking it's a simple function, as I did. The GRE makers always seem to have that convenient easy-way-out answer staring in your face, happy to lead you astray. :P

Apr 15, 2014 • Comment

Kevin Rocci, Magoosh Tutor

Great points, Yosef! The GRE makers love those trap answers. And nice use of "impetuously"! :)

Apr 18, 2014 • Reply

5

Gravatar Chris Lele, Magoosh Tutor

Oct 7, 2012 • Comment

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