Answer:
B and C
Step-by-step explanation:
There are 3 conditions for the difference of squares.
- The power on the variable must be even making A incorrect. x^2 - 16 is and example of what I mean. The 2 is even.
- The sign between 2 terms must be minus, making D incorrect.
- Any coefficient (given your examples) must be perfect squares. 9x^2 - 16. Nine and 16 are both perfect squares.
The correct answer is B and C
