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=2x²+x+4+x²-4x-2
=2x²+x²+x-4x+4-2
=3x²-3x+2
kalau ngk salah jwbnya itu
y" = x²-4x-2
y' = y"
2x²+x+4 = x²-4x-2
2x²-x²+x+4x+4+2 = 0
x² +5x +6 = 0
(x+2)(x+3) = 0
x+2 = 0
x = -2
x+3 = 0
x = -3
Hp x { -2, -3 }