Which equation is a quadratic equation?

y = -4(3x + 2)
y + 3x3 = (x - 2)(3x + 8)
y - 3 = (2x2 + 11)(x - 1) + 3x
y + 5x = -2x(4 - x) + 1

Question

Which equation is a quadratic equation?

y = -4(3x + 2)
y + 3x3 = (x - 2)(3x + 8)
y - 3 = (2x2 + 11)(x - 1) + 3x
y + 5x = -2x(4 - x) + 1

btaylor · Answer

a quadratic equation is ax^2 + bx + c. So one term has to be squared, but 2 is the highest degree. the first option is only degree 1, the second is degree 3, the third would be degree 3, and the fourth would be degree 2 (if you multiplied them out).
So y + 5x = -2x(4 - x) + 1 is the answer.

anonymous · Answer

Quadratic equations have the highest power as $x^2$.  Try distributing some of them a bit and solving for $y$ to see which one has $x^2$ as the highest power.

anonymous · Answer

Y+5x= -2x(4-x)+1

ashking1 · Answer

thks