Question

Berikan rumus suku ke-n dari barisan
1). -1/2, 2/3, -3/4, 4/5,....
2). 1, 4, 9, 16, ...

Answer 1

1.) Diket a=-½, b=

Un=a+b(n-1)
=-½+7/6(n-1)
=-½+7/6n-7/6
=

2.) Diket a=1, b=4-1=3
Un=a+b(n-1)
=1+3(n-1)
=1+3n-3
=3n-3+1
=3n-2