Question

If 9^x + a.3^x + 1 = 0 has no real solution for x then set of all real values of a is

• A. (– 2, 2)
• B. (– 2, ∞)
• C. (– , 2)
• D. None

Answer 1

Answer: (B)

(– 2, ∞)

Answer 2

Q 3^x + 3^–x = – a

for no solution

– a < 2

Ž a > – 2