Question

Identify which equation is a quadratic equation.
Answer

y = 3x + 4

y + x2 = (x - 2)(x + 7)

y = -4x(x - 4) + 2x

y + 3 = (x + 12)(x2 + 2)

Answer 1

first equation is a straight line
second one also is a straight line (x2 is on both sides, and it gets cancels out)
third one is a quadratic
fourth is cubic

Answer 2

Thanks!