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Math III Videos 103 videos
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It's super useful to be able to find the distance around stuff. Like when you’re being pursued by authorities while running around the base of an...
ACT Math 5.3 Intermediate Algebra 310 Views
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Description:
ACT Math: Intermediate Algebra: Drill 5, Problem 3. What does f(g(-1)) equal?
- Intermediate Algebra / Functions
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Chinese Subtitled
- Foreign Language / Spanish Subtitled
- Functions / Build new functions from existing functions
- Functions / Build new functions from existing functions
- Functions / Build new functions from existing functions
- Functions / Build new functions from existing functions
- Intermediate Algebra / Modeling
Transcript
- 00:02
Here's an unshmoopy question you may find on an exam somewhere in life...
- 00:06
If f of x equals 1 over x plus 1, and g of x equals x squared, what does f of g of negative 1 equal?
- 00:13
And here are the potential answers...
- 00:19
It's asking us about composite functions.
- 00:25
When we solve for f of g of negative 1, we're basically trying to find the result of g of
Full Transcript
- 00:31
-1 when sent through the function f of x.
- 00:36
g of negative 1 is just negative 1 squared...or 1.
- 00:41
This gives us f of 1... with 1 as our new x value. 1 over 1 plus 1 equals 1/2.
- 00:50
So the answer is D.
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