Question

What is the axis of symmetry for f(x) = -3x2 + 12x - 6?

Answer 1

first recognise this in the form
f(x) = ax^2 + bx + c

write down the values of
a,b,c

the axis of symmetry runs through the apex

the x value for the apex is given by

x = -b/2a

so you can solve from the above...