To write the any polynomial in standard form you must first put it in terms separated only by [tex]+,-[/tex] operators, then you must order terms [tex]x^n[/tex] descendingly according to [tex]n[/tex]. In your case [tex]-\frac{1}{5}x^2[/tex] will be the first term because it has highest power, followed by [tex]-8x^1[/tex] and [tex]+7x^0[/tex].
The standard form of this specific polynomial is:
[tex]-\dfrac{1}{5}x^2-2x+7[/tex].
Hope this helps.
