Question

A funçao f(X)= -x²-6x-9 intercepta o eixo x em:

Answer 1

x= -b +-√b²- 4 .a.c /2                                                                                                 x= -6 +- √6²-4.(-1).(9)/2(                                                                                          x=- 6 +- √0/2                                                                                                         x=-6+- 0/2                  x='-6/2  =-3                                                                                                          x"= -6/2=-3                 então a função intercepta o eixo x em -3