Question 43
Algebraic ExpressionsExpand the expression (3a − xy)(3a + xy).
- A.9a2 − x2y2
- B.9a2 + x2y2
- C.9a2 − xy
- D.9a2 + x2y
Show the answer and explanation
Answer: A (9a2 − x2y2)
Explanation
Difference of two squares: (3a)2 − (xy)2 = 9a2 − x2y2.
Expand the expression (3a − xy)(3a + xy).
Answer: A (9a2 − x2y2)
Difference of two squares: (3a)2 − (xy)2 = 9a2 − x2y2.