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;