Respostas

2013-04-16T15:27:54-03:00

x² - 8x + 7 = 0

a = 1
b = - 8
c = 7

delta = b² - 4*a*c
delta = (- 8)² - 4*1*7
delta = 64 - 28
delta = 36

x1 = (- b + raiz de delta) / 2*a = (+ 8 + 6) / 2*1 = 14 / 2 = 7

x2 = (- b - raiz de delta) / 2*a = (+ 8 - 6) / 2*1 = 2 / 2 = 1.

S = {1; 7}.

 

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