Question

Which expression is equivalent to 9n^2-25?

A. (3n-5)^2
B. (3n+5)(3n-5)
C. 9(n-4)^2
D. 9(n+4)(n-4)

Answer 1

Answer: B. (3n+5)(3n-5)

Step-by-step explanation:

Apply the difference of squares rule

a^2 - b^2 = (a+b)(a-b)

In this case you'll use a = 3n and b = 5.