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Nr natural x care verifică 4^x+2 - 5•4^x =44 este: a) 4 b) 1 c) 0 d) 2

Răspuns :

[tex]\it 4^{x+2}-5\cdot4^x=44 \Rightarrow 4^x(16-5)=44 \Rightarrow4^x\cdot11=44|_{:11}\Rightarrow4^x=4\Rightarrow x=1[/tex]