Question 2
Number BasesIf 125x = 2010, find x.
- A.2
- B.3
- C.4
- D.5
Show the answer and explanation
Answer: B (3)
Explanation
x2 + 2x + 5 = 20, so x2 + 2x − 15 = 0, (x + 5)(x − 3) = 0 and x = 3 (a base must be positive).
If 125x = 2010, find x.
Answer: B (3)
x2 + 2x + 5 = 20, so x2 + 2x − 15 = 0, (x + 5)(x − 3) = 0 and x = 3 (a base must be positive).