Question 1
Algebraic ExpressionsIf x + 1/x = 3, find the value of x3 + 1/x3
- A.18
- B.21
- C.27
- D.30
Show the answer and explanation
Answer: A (18)
Explanation
Cube both sides: x³ + 1/x³ + 3(x + 1/x) = 27, so x³ + 1/x³ = 27 − 3(3) = 18.
If x + 1/x = 3, find the value of x3 + 1/x3
Answer: A (18)
Cube both sides: x³ + 1/x³ + 3(x + 1/x) = 27, so x³ + 1/x³ = 27 − 3(3) = 18.