Question

Se log₅ 20 - log₅ 2 = log₅ 2x, o valor de x, é:

a) 5

b) 3

c) 1

d) -3

e) 3/5

Answer 1

log₅ 20 - log₅ 2 = log₅ 2x

log₅ (20/2) = log₅ 2x

log₅ 10 = log₅ 2x (÷log₅)

10 = 2x

10/2 = x

x = 5 ( Letra A )