Respostas

2014-05-08T21:48:36-03:00
A) =25 B) =20 C) =4 delta= (-20)*2 -4.25.4
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2014-05-08T21:52:44-03:00
(-20)² - 4*25*4
= 400 - 400 = 0

-(-20) +0 / 2*25 = 20/50 = 2/5
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