Помогите решить пример :с[latex]3^2^x^+^1-28*3^x+9=0[/latex]

[latex]3^{2x+1}-28*3^x+9=0\3^{2x}*3-28*3^x+9=0\3^x=t,t extgreater 0\3t^3-28t+9=0\D=28^2-4*3*9=784-108=676=26^2\\t_1=frac{28+26}{6}=frac{54}6=9\\t_2=frac{28-26}6=frac{2}6=frac{1}3\\ left[egin{array}{ccc}t=9\t=frac{1}3end{array}ight= extgreater left[egin{array}{ccc}3^x=3^2\3^x=3^{-1}end{array}ight= extgreater left[egin{array}{ccc}x=2\x=-1end{array}ight[/latex]