Question 11
SurdsSimplify 1/(3 + √5) − 1/(3 − √5)
- A.−½√5
- B.½√5
- C.−¼√5
- D.0
Show the answer and explanation
Answer: A (−½√5)
Explanation
Over the common denominator (3 + √5)(3 − √5) = 4, the top is (3 − √5) − (3 + √5) = −2√5. So the answer is −2√5/4 = −½√5.