baskara:
onde para
a = 2p
b = 3pq
c = 3q
substituindo
se
temos que
que é um sistema
simplificando temos:
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acho que pode continuar daqui.
para a proxima vc devera fazer algo semelhante, mas tendo em consideração que o delta de baskara deve ser obrigatoira mente positivo para ter 2 x reais. se for negativo, a raiz de numero negativo é complexa. e se for zero, vc só terá uma raiz tocando o eixo x.
O x_1 e o x_2 devem ser diferentes.
Bom estudo