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RE: #32
Posted:
Jun 17, 2010 8:14 AM


That depends on what you do first. If you square 3 and then take square root, the answer is 3. But if you take square root of 3 (i*sqrt3) and then square it, the answer is 3.
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From: ownernyshsmath@mathforum.org on behalf of Jonathan Sent: Wed 6/16/2010 3:15 PM To: nyshsmath@mathforum.org Subject: Re: #32
I belive you are correct. The square root of x squared is the absolute value of x. for example, the square root of (3) squared is 3, not 3. We noticed this as we were keying the exam. Jonathan Halabi HS of American Studies the Bronx
On Wed, Jun 16, 2010 at 2:48 PM, <TKENYON@crcs.wnyric.org> wrote:
I didn't teach the course this year, and most of the students had the same answer as was on the answer key, but unless it's declared "x>=0", isn't the square root of x² = absolute value of x, not just a plain x? i.e. the best answer for 32 would be x sqrt(3x) Am I missing something?
Tom Kenyon CRCS Mathematics/Physics tkenyon@crcs.wnyric.org ******************************************************************* * To unsubscribe from this mailing list, email the message * "unsubscribe nyshsmath" to majordomo@mathforum.org * * Read prior posts and download attachments from the web archives at * http://mathforum.org/kb/forum.jspa?forumIDg1 *******************************************************************
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