bantu in donk..soalnya sulit

saya kasih contoh:
a) [tex] 3^{2x} - 10. 3^{x} + 9 = 0 [/tex]

misal : [tex] 3^{x} = p [/tex]

[tex] p^{2} - 10p + 9 = 0 (p - 1)(p - 9) = 0 p = 1 atau p = 9 3^{x} = 1 atau 3^{x} = 9 x = 0 atau x = 2 [/tex]