Try this option:
1) for the given function 'f': the the axis of its symmetry is x= -2;
2) for the function 'g':
g(x)=4x²-16x+12; ⇔ g(x)=4(x²-4x+3); ⇔ g(x)=4(x-1)(x-3).
It means the axis of its symmetry is x=2.
Answer: -2 and 2
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