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Pupil
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posted by  Octans on 11/3/2009 11:18:57 AM  |  status: Closed  |  Earned Karma: 50

Please Help [This is a simple question]

Course Textbook Chapter Problem Needs by
Precalculus Precalculus: Mathematics for Calculus (5th) by Stewart, Redlin, Watson Chapter 1.5 Example 7 11/3/2009 at 3:00:00 PM
Question Details:
 x=     
the correct answer is x=
My math is really bad. Could anyone teach me how come the answer is =
Thanks so much.
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Pupil
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posted by jed38 on 11/3/2009 11:32:05 AM  |  status: Live
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Response Details:
all you are doing is cancleing the 2s. you know that 2/2 is 1 so you could split the fraction up to see it better you get
-2/2 +_ [2sqrt(-1)]/2    <-----the 2 on the bottom cancles with the 2 on the top
which gets you -1 +_ sqrt(-1)
all the problem is doing is cancleing the 2s..do you see that?
Scholar
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posted by eswarramesh on 11/3/2009 11:43:53 AM  |  status: Live
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Response Details:
given      x=
             now,       x =  2 ( -1 ± 1√-1) / 2                     [taking 2 common in numerator]
               2 in numerator and denominator gets cancelled and we get x = -1 ± √-1 
eswarramesh
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