Posted by Jessie on Thursday, January 24, 2008 at 4:36pm.
I need to find the derivative of the following problem via logarithmic differentiation, but I'm getting stuck. I know how to solve via logarithmic differentiation, but I can't figure out how to rewrite the exponent(s) as logs. Could someone help me?
y= (2x +1)^5(x^4  3)^6

Calculus  Damon, Thursday, January 24, 2008 at 4:54pm
Well, why do them that way?
but
ln y = 5 ln (2x+1) + 6 ln (x^43)
(1/y)dy/dx = 5 (2/(2x+1)) + 6 (4 x^3/(x^43))
now multiply both sides by y which is still (2x +1)^5(x^4  3)^6
ps  I would have just done it as a product of functions of x

Calculus  drwls, Thursday, January 24, 2008 at 4:56pm
log y = 5 log (2x+1) + 6 log (x^4 3)
(1/y)*dy/dx = 10/(2x +1) + 24 x^3/(x^4 3)
dy/dx = (2x +1)^5(x^4  3)^6 *
[10/(2x +1) + 24 x^3/(x^4 3)]
Check my work
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