Question

Ma puteti ajuta cu ex 4 si 5 va rog frumos?

Answer 1

4)
A=$9^{n+1}$ - $3^{2n}$ *5
A= (3²)ⁿ⁺¹ - $3^{2n}$ *5
A=$3^{2n+2}$ - $3^{2n}$ *5
A=$3^{2n}$ * 3² - $3^{2n}$ *5
A=$3^{2n}$ ( 9-5)
A=$3^{2n}$ *4
A=($3^{n}$*2)²
=>A-patrat perfect

5)

A= $2^{3x}$ + $2^{2x}$ * $2^{x}$ * $2^{2}$+ $2^{3x+3}$
A=$2^{3x}$ + $2^{3x}$ *4 +$2^{3x}$ * 8
A=13*  $2^{3x}$
13* $2^{3x}$ =64
13*  $2^{3x}$ = $2^{6}$
3x=6
x=2