4. Which of the following is a difference of two squares?
A. x2 - 6
B.x2y3 - 81
C. 4x² - 36
D. 8x
5. What is the other factor of 2x2 + 5x - 12 if one of its factors is x +. 4?
2x - 3
B 2x + 3
C. 2-8
D. 23​