Question

1º)Determinar o domínio das seguintes funções:
1) Y= 2X-3
2) Y= X2 -5X +6
3) Y = 1/ (X-9)
4) Y = 4/ ( X-2)
5) Y = 9-X

Answer 1

2) a=1
b=-5
c=6
delta=5²-4.1.6
delta=25-24
delta=1

x=-b+-delta/2.a
x¹=-(-5)+-1/2.1
x¹=5+-1/2
x¹=5-1/2
x¹=4/2==2

x²=5+1/2
x²=6/2==3