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Maka,
f(x) = 2x² + px - 1
Dari, faktor tersebut.
f(-2) = 0 dan f(1) = 0
Substitusikan.
f(-2) = 0
2(-2)² + p(-2) - 1 = 0
-8 - 2p - 1 = 0
-2p - 9 = 0
2p = -9
p = -9/2
f(1) = 0
2(1)² + p(1) - 1 = 0
2 + p - 1 = 0
p + 1 = 0
p = -1
Maka, agar dapat disederhanakan,
p bernilai -9/2 dan -1