Question

Aplicando as definições de logaritmo ,calcule a)log base 9 81 b)log base 4 64 c)log base 25 125 d)log base 4 0,25 e)log base 8 1/ 2 f)log base 7 7

Answer 1

A) 9^x=81
9^x=9^2
X=2
B)4^x=64
4^x=4^3
X=3
C)25^x=125
(5^2)^x=5^3
2x=3
X=3/2
D)4^x=1/4 4^x=4^-1 X=-1
E)8^x=1/2
(2^3)^x=2^-1
3x=-1
X=-1/3
F)7^x=7
X=1