Question

qual o valor de x na PA (2x-1,3x+1, x-1)

Answer 1

a2=a1+r
3x+1= 2x-1+r
3x+1-2x+1=r
r=x+2


an=a1+(n-1)*r
x-1=2x-1=(3-1)*r
x-1-2x+1=2r
-x=2r
-x=2(x+2)
-x=2x+4
-x-2x=4
-3x=4
3x=-4
x=-4/3