Question

Calcule a fórmula do termo geral de cada PA (p - 2,p,...)

Answer 1

(p, -2, -, ...)
a1 = p
r = -2-p
an = a1+(n-1).r
an = p+(n-1).(-2-p)
an = p + -2n-pn+2+p
an = 2p-2n-pn
an = 2p-n(2-p)
an = 2p-(2-p)n