Which function is a quadratic function?
y – 3x2 = 3(x2 + 5) + 1
y2 – 7x = 2(x2 + 6) + 7
y – 2x2 = 6(x3 + 5) – 4
y – 5x = 4(x + 5) + 9

Among the choices provided the quadratic function is the third one which is y – 2x2 = 6(x3 + 5) – 4. The quadratic function should be a form of this equation f(x) = ax2 + bx + c where in a, b, and c are any real number that is not equal to zero. If you try to solve the third equation:

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