Question

faça o estudo do sinal das funções y=x²-7X+10 E Y=-x²+8-16

Answer 1

     y = x^2 - 7x + 10
     Para determinar raízes
            x^2 - 7x + 10 =0                                  a > 0
     Fatorando                                            concavidade para acima
           (x - 5)(x - 2) = 0
                x - 5 = 0                                           x < 2    f(x) +
                                 x1 = 5                             x > 5    f(x) +
                x - 2 = 0                                           x = 2    f(x) = 0
                                 x2 = 2                             x = 5    f(x) = 0
                                                                        x > 2    f(x) -  
                                                                        x < 5    f(x) -

      y = - x^2 + 8 - 16
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