Question

prosze o obliczenie

a) log₂(x-1)=2

b) log ₉ 15 - log ₉ 20/3 + 2 log ₉ 6

Answer 1

a)

x - 1 = 2^2

x - 1 = 4

x = 5

 

b)

log9(15 : 20/3) + log9(6^2) = log9 (15 * 3/20) + log9 36 = log9 (45/20 * 36) = log9 (81) = log9 ((9^2) = 2log9 (9) = 2 * 1 = 2

Answer 2

Więc yo będzie tak : 

 

 

 a) x-1=2^2

     x-1=4

     x=5

 

 

b) log9(15:20/3)+log9(6^2)=log9(15 * 3/20)+log9 36=log9 (45/20 * 36)=log9 (81=log9 ((9^2) = 2log9 (9) = 2 * 1=2

 

 

Pozdrawiam i życzę powodzenia ;* .