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Maka
f(3)=-3 = (m-1)(3)^2 - 3(3) -9
-3 = 9(m-1) - 9 - 9
15 = 9(m-1)
5 = 3(m-1)
5/3 = m-1
5/3 + 1 = m
m = 8/3
f(3) = (m-1) (3)^2 -3(3)-9=0-3
f(3) = (m-1)9 =-3+9+9
f(3) = 9m-9 = 15
f(3) = 9m = 15+9
f(3) = m = 24/9
f(3) = m= 2,67