Let f x = 10 - x - 5 , x ∈ R , then the set of all values of x at which f f x is not differentiable is

Question

Let f x = 10 - x - 5 , x ∈ R , then the set of all values of x at which f f x is not differentiable is, 0,5 , 10, 5,10, 0,5 , 10,15, 5,10,15

MARKS App · Accepted Answer

f f x = 10 - f x - 5 = 10 - 10 - x - 5 - 5 = 10 - 5 - x - 5 ⇒ 10 - x - 5 - 5 Points where f f x is non-differentiable are x - 5 = 0 & x - 5 = 5 x = 5 & x = 0 , 10

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