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2px+4 = 0
Fungai maksimum jika x = 1,
2p+4 = 0
2p = -4
p = -2
Jika x = 1, f(x) = 6
f(x) = -2x²+4x+q
-2.1²+4.1+q = 6
2+q = 6
q = 4
p+q = -2+4 = 2