Cool math Pre-Algebra Help Lessons: Radicals

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Coolmath Pre-Algebra
Radicals lesson 1 - A Review of Radicals (page 4 of 5) page 1
---- This pre-algebra lesson reviews radicals and how they work.

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What about ?

Can we find a number that goes in this?

( )^2 = ( )( ) = -49

Since these are the same number, we'd either have

( )^2 = -49
That's why a square can't be negative!

In fact, this goes for ALL even roots.

Since no number works in

( )^4 = -16

There'd be an even number of the guy multiplied together:

( )( )( )( ) = -16 ... ( - )( - )( - )( - ) = + or ( + )( + )( + )( + ) = +
This negative can't happen!

Continued on the next page

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