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Coolmath Algebra
Radicals lesson 5 - Multiplying with FOIL   (page 3 of 3) page 1
---- This algebra lesson explains how to multiply radicals using FOIL.

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YOUR TURN:

( 9 + sqrt(2) )( 6 - sqrt(5) )

Here's another one -- and something cool is going to happen:

( 5 + sqrt(2) )( 5 - sqrt(2) ) = ( 5 )( 5 ) - 5*sqrt(2) + 5*sqrt(2) - ( sqrt(2) )( sqrt(2) ) = 25 - sqrt(4) = 25 - 2 = 23

No radicals in the answer!

TRY IT:

( 3 + sqrt(7) )( 3 - sqrt(7) )

 The printing and distribution and/or downloading of these lessons is strictly prohibited.
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