Calcule o valor numérico da expressão b² - 4.a.c para:

a) a = 1,b = 5 e c = - 6
b) a = - 1,b = - 5 e c = 6
c) a = 1,b = - 4 e c = 4
d) a = 2,b = - 4 e c = 4
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