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x² - 4x - 32 = 0
x1 + x2 = -b/a
= -(-4)/1
= 4..............opsi C
12. singular, maka det = 0
2.(2x-1) - 2(x-2) = 0
4x-2 -2x+4 = 0
2x = -2
x = -1.........opsi A