Question

09. Dados log 5 = x e log 7= y,
determine:
a) log 35
b) log 125
c) log 49
d) log 1,4​

Answer 1

a) log 35 =log 5*7 = log 5+log 7 =x+y

b) log 125 = log 5³ =3 * log 5 = 3*x

c) log 49 =log 7² = 2 * log 7 =2*y

d) log 1,4​ =log 14/10

= log 14 - log 10

=log 2*7 -log 10

=log 2+log 7 - log 10

****** log 2 =log 10/5 =log 10 - log 5 =1-log5 =1-x

=1-x +y-1 =y-x