[tex] \frac{5 ^{n+1} + 2*5^{n} + 5^{n+2} }{ 3^{n+2} + 2*3^{n+1} + 3^{n} } [/tex] =
[tex] \frac{ 5^{n}(5+2+ 5^{2}) }{ 3^{n}( 3^{2} +2+1)} [/tex] =
[tex] \frac{ 5^{n}(5+2+ 25) }{ 3^{n}( 9 +2+1)} [/tex] =
[tex] \frac{ 5^{n} * 32) }{ 3^{n}* 12} [/tex] = [tex] \frac{ 5^{n} * 8) }{ 3^{n}* 3} [/tex] = [tex] \frac{ 5^{n} * 5+3) }{ 3^{n}* 3} [/tex] = [tex] \frac{ 5^{n+1} +3) }{ 3^{n+1}} [/tex]