ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Create equations that describe numbers or relationships Videos 5 videos

SAT Math 2.3 Numbers and Operations
194 Views

SAT Math 2.3 Numbers and Operations. If Joaquin invests $500, how much will the investment be worth after 3 years?

CAHSEE Math 2.4 Mathematical Reasoning
185 Views

Mathematical Reasoning Drill 2 Problem 4. Which of the following expressions tells how much he spends on rent per month?

CAHSEE Math 5.4 Algebra I
236 Views

Math Algebra I: Drill 5, Problem 4. The following graph represents the solution set to which of the following systems of inequalities in two variab...

See All

SAT Math 6.1 Algebra and Functions 197 Views


Share It!


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).

Related Videos

SAT Math 2.1 Geometry and Measurement
2779 Views

SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?

SAT Math 9.4 Algebra and Functions
1300 Views

SAT Math 9.4 Algebra and Functions

SAT Math 9.2 Algebra and Functions
377 Views

SAT Math 9.2 Algebra and Functions

SAT Math: Identifying an Equation for the Average of Two Percentages
23 Views

In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...

SAT Math: Which Equation Represents Profit?
13 Views

Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...