[tex]3*9^{x} +11*3 ^{x} \ \textless \ [/tex]4

3 • 9^х + 11 • 3^х = 4 3 ^ Х = а 3а^2 + 11а - 4 = 0 D = 121 + 48 = 169 = 13^2 a1 = ( - 11 + 13 ) : 6 = 1/3a2 = ( - 11 - 13 ) : 6 = - 4 ( < 0 ) 3 ^ x = 1/3 X = - 1