Question

10.Calcule as raízes da função y = x² – 5x + 6.

a) 1 e 2
b) -2 e -2
c) -3 e -2
d) 2 e 3
e) 0

Answer 1

y= x^2 -5x + 6

a= 1

b= -5

c = 6

∆= b^2 -4*a*c

∆= (-5)^2 -4*1*6

∆= 25 - 24

∆= 1

x= (-b±√∆)/ 2*1

x= {-(-5) ± √1} / 2*1

x= {5 ± 1} / 2

x1= (5 + 1)/2 = 6/2 = 3

x2= (5-1)/2= 4/2= 2

item d) 2 e 3