Which of the following functions is quadratic?

Answer:sd
D. [tex]f\left(x\right)=2x^2+3x-5[/tex]
Step-by-step explanation:
Given choices are:
[tex]f\left(x\right)=\frac{2}{x^2}[/tex]
[tex]f\left(x\right)=3\left(3-x\right)[/tex]
[tex]f\left(x\right)=7^2[/tex]
[tex]f\left(x\right)=2x^2+3x-5[/tex]
Now we need to find about which of them is the quadratic function.
We know that quadratic function is written in form of [tex]f\left(x\right)=ax^2+bx+c[/tex]
Last choice looks similar to that form.
Hence coorect choice is D. [tex]f\left(x\right)=2x^2+3x-5[/tex]