Calcule o valor númerico das expressões algébricas: a) x² - 5x + 8 para x = 2
b) x² - 5x + 8 para x = -2 
c) x² + 2xy para x = -4 e y = 0
d) x² + 2xy para x = -2 e y = 3

ME AJUDEM POR FAVOR 
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