Identify whether each item represents a quadratic function. Write YES if it does and write NO if it does not.

1. f(x)= 3 - 6x - x²

2. x -2 -1 0 1 2
y 8 2 0 2 8

3. y + 3x² = 2 - 4x + 3x²

4. х -2 -1 0 1 2 у -1 1 3 5 7​