# Help with simple differentiation

• Oct 7th 2009, 07:19 AM
light85
Help with simple differentiation
Hi,
How do I solve for the following: $d/dx [(0.1x + 0.4)log(0.1x + 0.4)]?$

I got the following answer but I think its wrong: $(1/ln2) + 0.1log(0.1x + 0.4).$

Can somebody help?
• Oct 7th 2009, 07:46 AM
Calculus26
http://www.mathhelpforum.com/math-he...e1d8a387-1.gif

what base log are you using ?