Question

which of the following is a quadratic equation?

Answer 1

\[y=2x^{2}-12x+9\]
\[x=2y^2-9y+4\]
\[y=-x ^{2}+16\sqrt{x}-64\]
\[-3x+2y=-6\]

Answer 2

http://www.mathsisfun.com/algebra/quadratic-equation.html

Answer 3

so its "a."