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ACT Math Pre-Algebra: Drill 3, Problem 4. Find the solution to this equation.
Using Function Notations 1996 Views
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Description:
How do you use function notations? We're glad you asked! No, really. Otherwise, we made this video for nothing.
Transcript
- 00:00
using function notation -a la shmoop well thank goodness we never get
- 00:07
distracted while doing our math homework. but seriously do you see that Saints [girl frowns sitting at a desk]
- 00:11
game last weekend? what a blowout. what we're talking about again ?oh right
- 00:15
getting distracted. well any time we plug an x value into a function to see what
- 00:18
the corresponding Y value is we can get lost in our tracks and forget what we're [train goes by]
Full Transcript
- 00:22
doing. for example say we want to find the Y value the output, when X the input,
- 00:28
equals 3 for the equation y equals 4x minus 3. well if we forget what we
- 00:34
initially plugged in we'll have to go back to the question to figure it out. if
- 00:38
we use function notation and write f of 3 equals 4x minus 3 then plug into 3 we
- 00:44
end up with F of 3 equals 9. and remember that when X is 3 y or the output is 9. it [equation on screen]
- 00:52
might seem a bit funky the function notation becomes much easier to use over
- 00:56
time as long as we remember that X is the input and Y is the output. oh look a
- 01:01
squirrel. [squirrel runs in front of chalkboard]
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