Question

9^x-1 = 9

Answer 1

\(9^{x-1}=9\)

nên x-1=1

hay x=2

Answer 2

9^x-1=9

9^x-1=9¹

x-1=1

x=2

Answer 3

  9\(^{x-1}\)= 9

 9 \(^{x-1}\)= 9\(^1\)

 x-1=1

x = 1+ 1

x = 1

hok tốt ^^

Answer 4

Ta có : 9^x-1=9

=>9^x-1=9¹

^=>x-1=1

^=>x=2