Question

Determine a forma fatorada do trinômio x2-6x+8:

Answer 1

Alternativa "B"
D=b²-4.a.c = (-6)²-4.1.8=36-32=4.....=> VD=2 
x'=-b+VD/2a= 6+2/2 = 8/2= 4 
x''=-b-VD/2a= 6-2/2 = 4/2= 2 
==>a(x-x').(x-x'')=1(x-4).(x-2) = (x-4)(x-2).