Question

Which of the following are quadratic functions?
check all that apply

y=1/2x^2-13x+4
y=5+2x
y=2(x-3x^2+1)
y=x/x-1

Answer 1

The first 3 are all quadratic functions

Answer 2

i thought the second one wasnt because it is y=mx+b

Answer 3

Every function that can be written like y= ax^2 + bx + c is a quadratic function.

For the 2nd you can just consider a=0 b=2 and c=5