Answer:
(d) 49p² -9
Explanation:
You want to identify the difference of squares among the answer choices.
16m^3 -1
The odd exponent means the first term is not a square.
25b^2 +4
The plus sign (+) means the expression is not a difference. (It could be factored using complex numbers, but we expect you don't want to do that.)
10x^2 -169
The coefficient 10 is not a square.
49p^2 -9
This is the difference of squares: (7p)² -3².