Question

Qual o valor de x em :
a) $log_{3} x=4$
b) $log _{x} 1=0 ?$
c) $log _{x} 0,25=-1?$
d) $log _{x} 2=1?$

Answer 1

a) 3⁴=x
81=x

b)x⁰=1
x > 0
S= x ∈ IR | x > 0

$c)log_x0,25=-1 \\ x^{-1}=0,25 \\ x ^{-1}= \frac{1}{4} \\ x^{-1}= 4^{-1} \\ x=4$

$d)log_x2=1 \\ x^1=2 \\ x^1=2^1 \\ x=2$