Question

As raízes F(x)=x2-13x+36 é:
a)10 e 3
b)-8 e -9
c)8 e 9
d)-9 e 8

Answer 1

Delta= V169-4.1.36
Delta=V169-144
Delta=V25
Delta = +-5

Colocando na formula de baskara

-b +- _Delta_= _13+- 5_
             2.a            2.1

_13+- 5_= x'= (13+5)/2 =9
       2        x"= (13-5)/2= 4