ini gan cara penyelesaiannya : (k) = kuadrat --> PGSPD(k) = S(k) – (R+r)(k) 17(k) = 15(k) – (3+r)(k) 17(k) – 15(k) = -(3+r)(k) 289 - 225 = -(3+r)(k) 64 = -(3+r)(k) (3+r)(k) =√64 3+r = 8 r = 8 – 3 = 5
