Question 19
SurdsSimplify (√a + 1/√a)2 − (√a − 1/√a)2
- A.√a
- B.2/√a
- C.4
- D.2
Show the answer and explanation
Answer: C (4)
Explanation
Use p² − q² = (p + q)(p − q): (2√a)(2/√a) = 4.
Simplify (√a + 1/√a)2 − (√a − 1/√a)2
Answer: C (4)
Use p² − q² = (p + q)(p − q): (2√a)(2/√a) = 4.