4 P pangkat 2 dikurang 14 p dikurang 8 = 0

4 P² – 14 p – 8 = 0
(4×4) – 14 p – 8 = 0
16 p – 14 p – 8 = 0
2 p = 0 + 8
2 p = 8
P = 8 ÷ 2
P = 4