() 243 15. The sum of the solutions of the equation 9x - 6.3x + 8 = 0 is (1) log, 2 (2) log, 6 (3) log, 8 (x +3x+2). (4) log, 4 x(x + 1) 8

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( 9^{x}-6 cdot 3^{2}+8=0 Rightarrowleft(3^{x}right)^{2}-6 cdot 3^{x}+8=0 ) ( Rightarrowleft(3^{x}-4right)left(3^{x}-2right)=0 ) ( Rightarrow 3^{x}=2,4 ) ( Rightarrow x=log _{3} 2, log _{3} 4 ) Sum of solutions of given equation ( =log _{3} 2+log _{3} 4 ) ( =log _{3} 8 ) ophon (3) is corred-.

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