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ecuatia in R:
[tex]3^2^|^x^| - 9 = 0[/tex]


Răspuns :

[tex]3^{2|x|}-9 = 0 \\ \\ 3^{2|x|} = 9 \\ \\ 3^{2|x|} = 3^2 \\ \\ 2|x| = 2 \\ \\ |x| = \dfrac{2}{2} \\ \\ |x| = 1 \\ \\ x=1\quad $sau$ \quad x=-1 \\ \\ \boxed{S= \Big\{-1;$ $ 1\Big\}}[/tex]

[tex]\it 3^{2|x|}-9=0 \Leftrightarrow 3^{2|x|}=9 \Leftrightarrow (3^2)^{|x|}=9 \Leftrightarrow 9^{|x|} =9 \Leftrightarrow \\\;\\ \Leftrightarrow |x| = 1 \Leftrightarrow x=\pm1[/tex]