(k+2)(k+1)=6.12 penyelesainnya

(k + 2) (k +1 ) = 6.12
k^2 + 3k +2 = 72
k^2 +3k +2 -72 = 0
k^2 + 3k -70 = 0
(k + 10) (k -7) = 0
k +10 = 0 atau k -7 = 0
k = -10 atau k = 7
HP = { -10, 7 }