Derivatives of Sums
Example:
h(s) = (7*s - 5)-5 + s2
The first thing to notice when finding the derivative of this function
is that it is
the sum of several terms,
as shown in color below:
| h(s) |
= |
( (7*s - 5)-5 ) | + |
( s2 ) |
The Derivative Rule for Sums:
The derivative of a sum is the sum of the derivatives.
If
then the derivative of
z is
| |
z' |
= |
( f(x) |
+ |
g(x) )' |
| |
|
= |
f '(x) |
+ |
g'(x) |
So our example,
| h(s) |
= |
( (7*s - 5)-5 ) | + |
( s2 ) |
we can think of as
So the derivative is
| h '(s) |
= ( |
f(s) |
+ |
g(s) |
)' |
| |
= |
f '(s) |
+ |
g '(s) |
|
| |
= |
( (7*s - 5)-5) ' |
+ |
( s2) ' |
|
and we just need to know each of the derivatives on the right-hand
side of the equation. In this case these are
so the finished derivative is
| h '(s) |
= |
(-5)*(7*s - 5)-6 (7 - 0) |
+ |
2*s |
|
| |
= |
(-35)*(7*s - 5)-6 + 2*s |
![[]](/images/boxby.gif)
additional explanation for the derivative of sums
see another derivative of sums example
practice gateway test
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Page Generated: Fri Dec 19 04:42:16 2025
Comments to Gavin LaRose
glarose@umich.edu
©2001 Gavin LaRose,
University of Michigan Math Dept.