Verified answer

Resposta:

Explicação passo a passo:

a=3

b=18

c=-15

x=-18+-V18²+4.3.-15/2.3

x=-18+-V324-180/6

x=-18+-V144/6

x=-18+-12/6

x'=-18-12/6=-30/6=-5

x''=-18+12/6=-6/6=-1

S={-5,-1}