SAT Math 2.3 Algebra and Functions

and use them to find g of f of x.

As always, we start with the innermost set of parentheses.

We know that f of x equals x squared minus x.

Since we first want to find f of negative 2, we can replace x with negative 2.

If we do that, we get negative 2 squared minus negative 2 equals

4 minus negative 2, which equals 4 plus 2, which is 6.

f of negative 2 equals 6. Since we can replace f of negative 2 with

just plain old 6, the problem simplifies to g of 6.

G of x is equal to x minus 2, and in this case, x is f of negative 2, or 6.

So you just take 6 minus 2 to get 4, and... we've got our solution.

C's our guy.