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|B| = - 2
|C| = 3p - 5
AB = C, gunakan sifat determinan
|AB| = |C|
|A| . |B| = |C|
(-2)(-2) = 3p - 5
3p - 5 = 4
3p = 9
p = 3
diminta 2p² + p - 3
= 2(3)² + 3 - 3
= 18