Question

Coloquei foto pois ñ consegui escrever a fórmula. Borra ajuda ai.​

Answer 1

$a_n=5n-2$

a) Calculando $a_5$ e $a_2$:

$a_5=5*5-2 \\a_5=23\\\\a_2=5*2-2\\a_2=8\\\\Assim:\\\\a_5-a_2=23-8=15$

b) Calculando $a_3$ e $a_4$:

$a_3=5*3-2\\a_3=13\\\\a_4=5*4-2\\a_4=18$

$(a_3)^{2}=13^{2}=169\\\\(a_4)^{2}=18^{2}=324\\\\(a_3)^{2}+(a_4)^{2}=324+169=493$