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= -1
0 = a(-1)² +b(1) +3/2
-3/2 = a+b
0 = a+b + 3/2
a = -b - 3/2
b = -a - 3/2
0 = a(-3)² +b(-3) + 3/2
0 = 9a - 3b +3/2
a = -0,5
b = -1