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3.
3.
7 .
untuk x = 2
2³ - 14 . 2² + 2 .p + q = 0
8 - 64 + 2p + q = 0
2p + q = 64 - 8
2p + q = 56 ...... pers i
untuk x = 4
4³ - 14 . 4² + 4.p + q = 0
64 - 224 + 4p + q = 0
4p + q = 224 - 64
4p + q = 160 ..... pers ii
elemenasi pers i dan ii
4p + q = 160
2p + q = 56
-------------------- -
2p = 104
p =
p = 52
2p + q = 56
104 + q = 56
q = 56 - 104
q = - 48
p + q = 52 + - 48
= 4