Derivatives of Constant Multiples

Example:

g(x) = 2*e^sqrt(x)

The first thing to notice when finding the derivative of this function is that it is the product of a constant and another function, as shown in color below:

g(x)

e^sqrt(x)

The Derivative Rule for Constant Multiples:

The derivative of a constant multiple is the constant times thederivative of the function.
If

( f(x) )

then the derivative of z is

	z'	=	( c	f(x) )'
		=	c	f '(x)

So our example,

g(x)

e^sqrt(x)

we can think of as

g(x)

f(x)

So the derivative is

g '(x)	= (	c	f(x)	)'
	=	c	f '(x)
	=	2	(e^sqrt(x))'

and we just need to know the derivative on the right-hand side of the equation. In this case this is

e^sqrt(x)

(1/2)*e^sqrt(x) x^-1/2

(by the chain rule)

so the finished derivative is

g '(x)	=	2	( (1/2)*e^sqrt(x) x^-1/2 )
	=	x^-1/2 e^sqrt(x)

additional explanation for the derivative of constant multiples
see another derivative of constant multiples example
practice gateway test
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Comments to Gavin LaRose
glarose@umich.edu
©2001 Gavin LaRose, University of Michigan Math Dept.