Question 19
Algebraic ExpressionsIf x + 1/x = 4, find x2 + 1/x2
- A.16
- B.14
- C.12
- D.9
Show the answer and explanation
Answer: B (14)
Explanation
Square x + 1/x = 4: x2 + 2 + 1/x2 = 16, so x2 + 1/x2 = 14.
If x + 1/x = 4, find x2 + 1/x2
Answer: B (14)
Square x + 1/x = 4: x2 + 2 + 1/x2 = 16, so x2 + 1/x2 = 14.