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Algebra Videos 26 videos

SAT Math 1.5 Algebra and Functions
218 Views

SAT Math 1.5 Algebra and Functions. If f (x) = x2 - 16 and g(x) = x4 - 256, what is f of x divided by g of x?

ACT Math 1.5 Intermediate Algebra
386 Views

ACT Math Intermediate Algebra Drill 1, Problem 5. Can you simplify the expression?

ACT Math 2.1 Intermediate Algebra
359 Views

ACT Math Intermediate Algebra Drill 2, Problem 1. Solve the equation.

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SAT Math 6.1 Algebra and Functions 197 Views


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Description:

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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