Dados a= (5x +5) e b = (x + 5), simplifique a expressão E = (5x +5)² - 2 . (5x + 5) + (x + 5)² e, depois, calcule o valor númerico da forma fatorada para x= 240
a) -960
b) 0
c) 240
d) 960
e) 960²
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