Question

calcule as raízes das seguintes equaçoes:
x2-6x+8=0

Answer 1

x2-6x+8=0

a=1    b= -6      c= +8
▲= b² -4.a.c = (-6)² -4.(1).(+8) = 36 -32 = 4

x= (-b ± √▲)/2.a
x= [-(-6) ± √4]/2.1
x= [+6 ± 2]/2
x'=[6+2]/2= 8/2= 4
x"=[6-2]/2= 4/2= 2

S{4 e 2}