For the polynomial 8x3y2 – x? y2 + 3xy2 – 4y3 to be fully simplified and written in standard form, the missing exponent on the x-term must be

A polynomial in standard form has terms arranged with the highest exponent on leftmost side and the lowest exponent on the right end. The variables are also arranged alphabetically.

Therefore, the exponent of the x-term must be 2 for the polynomial to be fully simplified and written in standard form.