Question

Which of the following is a quadratic function?
A)y = x2 – 20
B)y = x3 – 25x
C) y = x4 + 13x
D)y = x – 49

Answer 1

Did you mean
\[y = x^2 -20\]\[y = x^3 -25x\]\[y = x^4 +13x\]\[y = x-49\]

Answer 2

It's okay. In pellet case have look at the highest exponent in each term and look if it's squared.

Answer 3

So for example \(y = x^3-25x\) is cubic.

Answer 4

how is that a cubic

Answer 5

Because the highes exponent is \(3\)

Answer 6

is it C) y = x^4 + 13x

Answer 7

Okay lets first make yourself clear what a quadratic function is.

Answer 8

So \(x^1\) is a linear function, \(x^2\) is called quadratic and \(x^3\) is cubic