Question 4 (1 point) Multiply. (7m+9)^2 a 7m^2+81 b 49m^2+81 C. 7m^2+126m+81 d 49m^2+126m+81

To multiply , we can use the formula for the square of a binomial: .In this case, and . Plugging these values into the formula, we get: Simplifying further, we have: Therefore, the correct answer is d) .