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Maka,
f(-3) = 0
Didapat:
2(-3)³+3p(-3)²+7(-3)-6 = 0
-54 + 27p - 21 - 6 = 0
27p - 81 = 0
27p = 81
Didapat, p = 3
Maka, dengan horner.
Penjabaran horner ada di lampiran.
Didapat faktor:
(x+3)(2x²+3x-2)
= (x+3)(2x-1)(x+2)
= 2(x+3)(x-½)(x+2)
Didapat (Akar yang lain):
x₁ = ½
x₂ = -2
Maka,
x₁² + x₂² adalah:
= (½)² + (-2)²
= ¼ + 4
= 17/4 [C]