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w2+2w=99

w2+2w-99=0 (quadratic equation)

Find two number that multiply to get 99 and add to get 2

The numbers are 11 and -9

soooo.

(w-9) (w+11)=0

w-9=0 w+11=0

w= 9 w=-11

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โˆ™ 2010-05-04 20:12:56
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