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CAHSEE Math 1.5 Algebra and Functions 218 Views


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Description:

Algebra and Functions: Drill Set 1, Problem 5. Evaluate the expression.

Language:
English Language

Transcript

00:03

And here's another shmoop du jour.

00:05

Evaluate the expression 2ab - 3 times the square root of bc... for a = 9, b = 4, and c = 1.

00:14

Here are the potential answers...

00:16

Hit the pause button and try this thing first yourself.

00:20

So, this is just testing whether we can... plug. So... let's.

00:27

If we take the base case equation here...

00:29

...and plug in the numbers as noted here...

00:31

...we get 2 times 9 times 4 minus 3 times the square root of 4 times 1.

00:38

Now let's simplify this mess.

00:40

2 times 9 is 18... times 4 is 72... minus 3 times the square root of 4... which is 2...

00:47

or 3 times 2, which is 6

00:50

So we have 72 minus 6 which is... the devil's number.

00:54

Or...D. As in devil.

00:55

It's okay. We'll get a priest in here to get this problem exorcised.

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