Let f x be a differentiable function at x = a with f ' a = 2 and f a = 4 . Then lim x → a x f a - a f x x - a equals:

Question

Let f x be a differentiable function at x = a with f ' a = 2 and f a = 4 . Then lim x → a x f a - a f x x - a equals:, a + 4, 2 a - 4, 4 - 2 a, 2 a + 4

MARKS App · Accepted Answer

f ' a = 2 , f a = 4 lim x → a x f a - a f x x - a ⇒ lim x → a f a - a f ' x 1 (L'Hospitals rule) = f a - a f ' a = 4 - 2 a

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