Question

If y = 3^x–1 + 3^–x–1 ; x Ī R, then least value of y is

• A. 2
• B. 6
• C. 2/3
• D. None

Answer 1

Answer: (C)

2/3

Answer 2

y = $\frac{1}{3}\left( 3^{x} + \frac{1}{3^{x}} \right)$ Ž y_min = $\frac{1}{3} \cdot 2$