simplify [sqrt(17)+sqrt(7)]*[sqrt(17)-sqrt(7)]  TOPIC_SOLVED

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simplify [sqrt(17)+sqrt(7)]*[sqrt(17)-sqrt(7)]

Postby buddy on Fri Feb 27, 2009 5:44 pm

i have to simplify [sqrt(17)+sqrt(7)]*[sqrt(17)-sqrt(7)]

does that mean multiply it out? how do i do that?
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Postby stapel_eliz on Fri Feb 27, 2009 6:54 pm

buddy wrote:simplify [sqrt(17)+sqrt(7)]*[sqrt(17)-sqrt(7)]

Yes, you need to multiply this out. But it's a pretty simple thing to do, if you recognize that this is the factored form of a difference of squares.

. . . . .

Letting and , what do you get? :wink:
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Re: simplify [sqrt(17)+sqrt(7)]*[sqrt(17)-sqrt(7)]

Postby buddy on Sat Feb 28, 2009 8:19 pm

17-7=10?
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Postby stapel_eliz on Sat Feb 28, 2009 10:20 pm

buddy wrote:17-7=10?

Yup! :D
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