Question

Determine a PA (-2,-5,-8,-11)

Answer 1

Resposta:

PA ( -2,-5,-8,-11)

Fórmula geral da PA -> An = a1+ ( n-1).r

a1= -2

razão = ( - 5 - ( -2))= -5 +2 = -3

An= a1+ ( n-1).r

An= -2 + ( -3-1).-3

An = -2+ ( -4 ).-3

An= -2 + 12

An= 10