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f(-2)=3
-2p+q=3
q=3+2p --> persamaan 1
f(6)=-1
6p+q=-1
q=-1-6p --> persamaan 2
susbtitusi persamaan 1 dan 2
3+2p = -1-6p
8p = -4
p = -1/2
subtitusi p pada persamaan 1
q = 3+2(-1/2)
q = 3-1 = 2
p x q = -1/2 x 2 = -1