Which of the following is not irrational?
A. (3+√7)
B. (3-√7)
C. (3+√7) (3-√7)
D. 3√7
Answer:C
Which of the following is not irrational?
A. (3+√7) B. (3-√7) C. (3+√7) (3-√7) D. 3√7
Explanation: If we solve, (3+√7) (3-√7), we get;