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3. Zeregina.

a) f(x) = x2
b) f(x) = 2x2
c) f(x) = - x2
d) f(x) = - x2 /2
e) f(x) = x2 + 1
f) f(x) = x2 - 2
g) f(x) = - x2 + 2
h) f(x) = x2 - 2x
i) f(x) = x2 + 3x
j) f(x) = 2x2 - 3
k) f(x) = - x2 + 4x
l) f(x) = x2 - 6x + 8
m) f(x) = - x2 + 4x - 6