Question

Tìm x:

3^2x+2=9^x+3

^{Nhớ ghi cách giải}

Answer 1

Ta có: 3^{2x + 2} = 9^{x + 3}

=> 3^{2x + 2} = (3²)^{x + 3}

=> 3^{2x + 2} = 3^{2x + 6}

=> 2x + 2 = 2x + 6

=> 2x + 2x = 6 + 2

=> 4x = 8

=> x = 2

Answer 2

3^2x+2=9^x+3

=> 3^2x+2=(3²)^x+3

=> 3^2x+2=3^2x+6

=> 2x+2=2x+6

=> 4x=8

=>x=2