Math Is Fun Forum

4littlepiggiesmom

Member

Registered: 2006-01-09

Posts: 42

Multiplying adn dividing Radicals Help Pleaseeeeee!

34. (sqrt)3{5(sqrt)s +(sqrt)3} I come up with 8(sqrt)6  am I on the right track or do I need to buy a whole new train??

38 {(sqrt)c +d}{3+(sqrt)5} I get 8(sqrt)6+3d+d(sqrt)5????

Last one 14/{60 -(sqrt)578} no idea where to start even??

Any and all help would be great but I'd rather get started in the right directions over just getting the answers...thank again! A

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,421

Re: Multiplying adn dividing Radicals Help Pleaseeeeee!

34.Is the question √3{5√3+√3}?
If so, the answer is √3{6√3}or 6 x 3, i.e. 18.
If the questions is
√3{5√s+√3}, the answer is 5√(3s)+3.

38. {√c+d}{60-√578}
If this is the question, the answer would be

60√c-√(578c)+60d-d√578.

This cannot be simplified further.

Remember, √a+√a=2√a,
√a x √a = √a²=a

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