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1 0
= 1(0) - 2(1)
= 0 - 2
= -2
Det A = 1(4) - 2(3)
= 4 - 6
= -2
Det A . Det B = Det (A . B)
-2 . -2 = 3p - 5
4 = 3p - 5
3p = 5 + 4
3p = 9
p = 9/3
p = 3
p² - 2p + 1
(3)² - 2(3) + 1
9 - 6 + 1
9 - 7
2