SAT Math 2.3 Algebra and Functions

SAT Math 2.3 Algebra and Functions. Calculate this function.

AlgebraFunctions
FunctionsBasics of Functions
Function Notation
Function Rules
LanguageEnglish Language
Product TypeSAT Math
SAT MathAlgebra and Functions

Transcript

00:23

and use them to find g of f of x.

00:25

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

00:30

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

00:35

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

00:41

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

00:47

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

00:51

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

00:56

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

01:01

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

01:10

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

01:15

C's our guy.