Question

Calcule as equações exponenciais

A)3 elevado a x = 1/27
B)25 elevado a x = 125
C) 8 elevado a x = 64
E) 5 elevado a x = 25
F) 7 elevado a x = 1/49
E) 5 elevado a x = 1/25

Answer 1

a) 3^x = 3^-3
Cancelando as bases:

x = -3

b) 25^x = 125
5^2x = 5^3
Cancelando as bases:

2x=3
x=3/2

c) 8^x = 64
8^x = 8²
Cancelando as bases:

x=2

d) 5^x = 25
5^x = 5²
Cancelando as bases:

x=2

e) 7^x = 1/49
7^x = 7^-2
Cancelando as bases:

x= -2

f) 5^x = 1/125
5^x = 5^-3
Cancelando as bases:

x= -3