Question 29
SurdsFind the product of (2√y − 3y) and (3y + 2√y)
- A.4y + y2
- B.4y + 9y2
- C.4y − 9y2
- D.−4y − 9y2
- E.2y + y2.
Show the answer and explanation
Answer: C (4y − 9y2)
Explanation
This is (2√y − 3y)(2√y + 3y), a difference of two squares: (2√y)² − (3y)² = 4y − 9y².