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Algebra and Functions Videos 140 videos

SAT Math 1.2 Algebra and Functions
359 Views

SAT Math: Algebra and Functions Drill 1, Problem 2. Based on the data in the table, what is the maximum heart rate for the average 22-year-old?

SAT Math 1.3 Algebra and Functions
220 Views

SAT Math 1.3 Algebra and Functions. How many 16 oz. bottles did she buy?

SAT Math 1.4 Algebra and Functions
207 Views

SAT Math 1.4 Algebra and Functions. Solve for x.

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SAT Math 8.5 Algebra and Functions 214 Views


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Description:

SAT Math 8.5 Algebra and Functions

Language:
English Language

Transcript

00:02

Buckle up! It's question time.

00:05

When you square a certain number, the result is equal to ten times the number plus the number again.

00:11

What is the number?

00:14

Another equation given to us in words that we have to translate to numbers…

00:18

Let’s call the number we’re looking for x.

00:21

Squaring x gives us x squared… …which equals ten times the number…

00:25

10x…plus the number again…so PLUS x.

00:30

We can write this as the equation x squared equals 11x.

00:34

What number squared equals 11 times that number?

00:39

We can solve the problem with a little logic. Well…it must be 11…

00:42

See how it works. 11 times 11 is 121. 11 squared is 121 and they equal each other.

00:49

If we weren’t sure though, x squared is the same as x times x…

00:53

…so we can simply divide x from both sides. The correct answer is 11 and we're done!

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