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CGP EDU Academic Team
Published on: August 14, 2026
If the larges interval of x in which the function f(x)=x 3 -3x+1 is decreasing is (a,b), then the value of a+2b is equal to
Text Solution
Verified by ExpertsThe correct answer is:
C
1
As f ' (x) = 3x 2 - 3 = 3 (x - 1) (x + 1)
i.e. the largest interval in which f (x) decreases is (-1,1) 
a = -1
b=1
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