Question

Which of the following is a quadratic function? Answer

y = x3 − 3x − 20

y = 3x – x + 4

y = x2 – 4x + 7

y = 2x4 + 9x + 17

Answer 1

y = x2-4x+7

Answer 2

quadratic function means the degree is 2

Answer 3

which of the choices has degree 2?

Answer 4

Note that a quadratic function has the terms:

a(x^2) + bx + c - one with x^1 (or x) and (x^2). Therefore, C is the correct answer.

Answer 5

not necessarily it has one x^1

Answer 6

\[y = x^2+1\]
that's still quadratic
\[y = x^2\]
that's also quadratic
\[y = x+1\]
that however is not quadratic anymore