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Coolmath Algebra
Radicals lesson 1 - A Review of Radicals   (page 2 of 5) page 1
---- This algebra lesson reviews radicals and how they work.

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TRY IT:

sqrt(9) sqrt(37) sqrt(-16)

Cube Roots:

Here are a few cube roots:

cube root of 8 = 2 cube root of 1 =1 cube root of -64 = -4

OK...  So, how am I figuring these out?

Pretty easy.

If I want , I ask myself

"What number cubed gives me 27?"

( )^3 something cubed

( 3 )^3 = 27 leads to the cube root of 27 = 3

Here's a trickier one:

cube root of -8 = ?

Hey, that inside guy is negative!  Are we allowed to do this? We sure couldn't do square roots of negative guys.

Let's think about it...

Continued on the next page
 

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