Question

Determine o 11 termo da pa (2x-y,3x,...)

Answer 1

Resposta:

a1=2x-y

a2=3x

razão =a2-a1 =3x-(2x-y) =3x-2x+y = x+y

an=a1+(n-1)*r

a11=2x-y +(11-1)*(x+y)

a11=2x-y+10x+10y

a11=12x+9y  é a resposta