Which of the following is a quadratic function? O A. y= - x2 +16V - 64 x² 5-64 O B. y=2x2 - 12x+9 O c. – 3x+2y= -6 D. * = 2y2 - 9y+4

A quadratic function has the form:
y = ax^2 +bx + c
where: a, b and c are not equal to zero.
So, the correct option is B.
y= 2x^2 - 12x + 9