2*3 la x -3 la x +1 +27=0​
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Răspuns :

[tex]\it 2\cdot3^x-3^{x+1}+27=0 \Rightarrow2\cdot3^x-3\cdot3^x+3^3=0 \Rightarrow 3^x(2-3)-3^3=0\Rightarrow\\ \\ \Rightarrow -3^x+3^3=0 \Rightarrow 3^3=3^x \Rightarrow x=3[/tex]