Question

resolva as equaçoes  do 2 grau usando a formula geral..
             -x²+x+12=0.
presizo da conta e nao so do resultado

Answer 1

-x²+x+12
x=-b+/-√b²-4ac
           2a
x=-1+/-√1²-4.-1.12
          2.-1
x=-1+/-√1+48
          -2
x=-1+/-√49
         -2
x=-1+/-7
       -2
x¹=-1-7-->>-8/-2=4
        -2
x²=-1+7--->>6/-2=-3
        -2
S={-3,4}