Choose the missing exponent to create a polynomial? 3x^4+4x^2-9x^-? +2 1) 2 2)3 3)-9 4)7 5)4

3.

The answers 2 and 4 are incorrect because inserting that ad the missing exponent would create only a trinomial.

-9 is incorrect as it would create something more than a polynomial. 7 is incorrect as, if doing a certain type of division, would result in a larger polynomial.

Hope this helps!