Answer:
[tex]5 {x}^{2} + 9x - 1[/tex]
Step-by-step explanation:
A quadratic expresion is of the form
[tex]a {x}^{2} + bx + c[/tex]
where
[tex]a \ne0[/tex]
The give options are:
[tex]9x-2[/tex]
[tex]5{x}^{2}+9x - 1[/tex]
[tex]-2x^3+8 {x}^{2} -7x +1[/tex]
[tex]x^4-12x^3+8 {x}^{2} -7x +1[/tex]
From the given options, the only expression which is quadratic is
[tex]5 {x}^{2} + 9x - 1[/tex]
where a =5, b=9 and c=-1
Therefore the correct choice is the second option.
