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f(3) = 3 kuadrat + 3p + q = -3
9 + 3p + q = -3
3p + q = -12
f(-1) = -1 kuadrat -p + q = 6
1 - p + q = 6
-p + q = 5
kita eliminasi kedua persamaan tsb
3p + q = -12
-p + q = 5
_________ ____
4p = -17
p = -17/4
subtitusikan
-p + q = 5
-(-17/4) + q = 5
17/4 + q = 5
q = 3/4