Question

se log (2x-20) = 2, calcule o valor de x.

a) 1
b) 20
c) 30
d) 60
e) 50

Answer 1

Alternativa D: 60

Aplicando-se o conceito de logarítmo tem-se:

$Log (2x - 20) = 2\\\\CE: 2x - 20 > 0\\\\x > 10$

$10^2 = 2x - 20\\\\2x - 20 = 100\\\\2x = 100 + 20\\\\2x = 120\\\\x = 120 / 2\\\\x = 60$

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Answer 2

log (2x-20) = 2

2x-20 = 10^2

2x-20 = 100

2x = 120

x = 60