-3*(x-2)^2+4
We can multiply this out like this...
-3(x - 2)2 + 4
(-3)(x - 2)(x - 2) + 4
(-3)(x2 - 2x - 2x + 4) + 4
(-3)(x2 - 4x + 4) + 4
-3x2 + 12x - 12 + 4
-3x2 + 12x - 8