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SAT Math 6.1 Algebra and Functions 197 Views


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SAT Math 6.1 Algebra and Functions

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it...

00:05

Which function fits the chart?

00:08

And here are the potential answers...

00:13

To solve this problem, we basically just have to see which of the functions give outputs

00:16

that match the inputs.

00:19

We'll start with our first x value, -4.

00:21

If we plug -4 into our mystery function, we should get 33 as our answer.

00:26

Answer choice A is the function -4x + 1.

00:30

If we plug in -4, we'll get f of x is equal to 17.

00:36

Onto B.

00:37

B says that f of x is equal to 2x squared + 1.

00:41

If we plug in -4... and that gets us 33.

00:46

And that's what we're looking for.

00:48

C tells us that f of x is equal to 2x + 1.

00:51

Plugging in -4, we get -8 +1, that's -7.

00:55

Doesn't help us. Bye!

00:56

How about D?

00:57

f of x is equal to 4x squared + 1.

01:00

Plugging in -4, we get -4 times -4 is 16 times 4... that's 64 +1 is 65, which is too big.

01:09

So D is out.

01:10

Final chance: (E).

01:12

f of x is equal to -4x squared + 1.

01:15

If we plug in -4, -4 times -4 is 16 times -4... that's -64 +1 is -63.

01:26

Which is... not 33.

01:28

The only function that gave us the proper output when we plugged in -4 was (B).

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