Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If a = min {x 2 + 4x + 5, x ∈ R} and
b = 
then the value of 
is-
A
B
2 n + 1 – 1
C
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
B
a = min{x 2 + 4x + 5} = 
= 1
b = 
= 2
= 
= 2 n (1 + 2 –1 + 2 –2 + .... + 2 –n )
= 2 n 
= 2 n+1 – 1
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