Question 492108
i believe the answer would be:


(4x^2 - 11y^2) * (4x^2 + 11y^2)


you will get:


16x^4 - 4x^2*11y^2 + 4x^2*11y^2 - 121y^4


the middle terms will cancel out and you will be left with:


16x^4 - 121y^4


this is the same as (a^2 - b^2) = (a-b) * (a+b)


you get a^2 - ab + ab - b^2 which results in a^2 - b^2 because the middle terms cancel out.