Question 41455
(-6x^4+3x^2-16)+ (4x^2+4x-7) let's remove these unnecessary parantheses;

-6x^4+3x^2-16+ 4x^2+4x-7  Now we can add the like terms, terms that have the same degrees;

-6x^4+7x^2+4x-16      (The only like terms in the given expression were; 3x^2 and 4x^2)