Question

Gente, me ajuda a responder por favor!
Responda as equações do 2° grau:
-2(x+1) (x-3)=0
-3t²+4t-5=0

Answer 1

AnaClara
 
                A primeira está na sua forma fatorada
                      - 2(x + 1).(x - 3) = 0
                                       x + 1 = 0
                                                        x1 = - 1
                                       x - 3 = 0
                                                        x2 = 3
                                                                            S = { - 1, 3 }

              Segunda
                       - 3t² + 4t - 5 = 0
                  Usando fórmula geral
                      x = (- b +/- √D)/2.a
                                                        D = b^2 - 4.a.c
                                                        D = 4^2 - 4(- 3)(- 5)
                                                            = - 44
                                                        D < 0  NÃO HÁ SOLUÇÕES REAIS