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SAT Math 8.5 Algebra and Functions 214 Views


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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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