Question

Ajudem com esses exercicios de Log VALENDO 15 PONTOS

a) log 8 base x = 3
b) Log 1/10 base x= 2
c)log x base 2 = 5
d) log 27 base 9 =x

Answer 1

a) log 8 = 3  ==> x^3 = 2^3 ==> x= 2
         x
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b) Log 1/10 = 2 ==> x^2 = 10^-1 ==> x = +/-√10^-1   ou x = +/- 10^-1/2 
          x
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c)log x = 5 ==> x = 2^5 ==> x = 32
        2
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d) log 27 = x ==> 9^x = 27 ==> 3^2x = 3^3 ==> 2x = 3 ==> x = 3/2
         9