A quadratic function is of the form:
[tex]y=ax^2+bx+c[/tex]That is, a function of degree 2.
- In this case, the function
[tex]3x^2+5x=0[/tex]It is a function of degree 2, so it is a quadratic function.
- For the function
[tex]3x-5=0[/tex]We see that it does not have a term of degree 2, therefore it is not a quadratic function.
- And for the function
[tex]y=3x^3+7x^2-9x[/tex]It is a function of degree 3, therefore, it is not a quadratic function.
Answer:
[tex]3x^2+5x=0[/tex]