D. 8. Which expression is a factor 16x^2-81 7 4x-9 Do 4x-81 Do 8x-9 Do 8x-81

To factor the expression , we can use the difference of squares formula, which states that .In this case, we have , which can be rewritten as .Using the difference of squares formula, we can factor this expression as .Therefore, the correct answer4x-9$.