Question 49
SurdsSimplify: 20/(5√28 − 2√63)
- A.5√7/7
- B.5√5/7
- C.7√5/5
- D.7√7/5
Show the answer and explanation
Answer: A (5√7/7)
Explanation
5√28 = 10√7 and 2√63 = 6√7, so the denominator is 4√7. 20/(4√7) = 5/√7 = 5√7/7.
Simplify: 20/(5√28 − 2√63)
Answer: A (5√7/7)
5√28 = 10√7 and 2√63 = 6√7, so the denominator is 4√7. 20/(4√7) = 5/√7 = 5√7/7.