Question

Số x thỏa mãn 3^x+1=9^x là x =?

Answer 1

3^x+1 = 9^x

3^x+1 = 3^2x

x + 1 = 2x

2x - x = 1

x = 1 

Answer 2

3^x+1=9^x=(3^2)^x=3^2x

=>x+1=2x

=>2x-x=1=>x=1

Answer 3

=>3^x+1=(3²)^x

=>3^x+1=3^2x

=>x+1=2x

=>2x-x=1

=>x=1