dau cea mai mare coroana ex 11 a si b

[tex] a)8^{n+3}=512\\\\8^{n+3}=8^{3}\\\\n+3=3\\\\ n=3-3\\ \\ n=0 [/tex]
[tex] b)4^n+4^{n+1}=20 \\\\ 4^n+4*4^n=20 => 5*4^n=20 => 4^n=4 => n=1 [/tex]