Question 10
SurdsEvaluate: 2√28 − 3√50 + √72
- A.4√7 − 21√2
- B.4√7 − 11√2
- C.4√7 − 9√2
- D.4√7 + √2
Show the answer and explanation
Answer: C (4√7 − 9√2)
Explanation
2√28 = 4√7, 3√50 = 15√2 and √72 = 6√2. So the result is 4√7 − 15√2 + 6√2 = 4√7 − 9√2.
Evaluate: 2√28 − 3√50 + √72
Answer: C (4√7 − 9√2)
2√28 = 4√7, 3√50 = 15√2 and √72 = 6√2. So the result is 4√7 − 15√2 + 6√2 = 4√7 − 9√2.