Maths - Derivative
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Maths - Derivative

by Pratibha Singh
(Kolkata)

If f (x) =x, then f’ (5) =

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Maths - Derivative

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Aug 14, 2011
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Finding the Derivative
by: Staff


The question:

by Pratibha Singh
(Kolkata)


If f (x) =x, then f’ (5) =



The answer:

f(x) =x

-----------------------------------
using the “power rule”:

f(x) = xⁿ

f’(x) = nxⁿ⁻¹

------------------------------------------------

f(x) = x

f(x) = x¹

f’(x) = 1*x¹⁻¹

f’(x) = 1*x⁰

f’(x) = 1*1

f’(x) = 1

the slope of f(x) = x when x = 5

f’(5) = 1

the final answer: f’(5) = 1



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