Posted by **carlton** on Sunday, February 19, 2012 at 1:25am.

find the derivative

ln [x^3 +((x+3)^3)((x^2)+4)^7

- cal 2 -
**drwls**, Sunday, February 19, 2012 at 1:30am
You left out a ] somewhere

- cal 2 -
**Steve**, Sunday, February 19, 2012 at 11:39am
Hmm the logical fix would be

ln [x^3 +((x+3)^3)]((x^2)+4)^7

a^3 + b^3 = (a+b)(a^2-ab+b^2), so

x^3 + (x+3)^3 = (x+(x+3))(x^2 - x(x+3) + (x+3)^2)

= (2x+3)(x^2 + 3x + 9)

and the log of the product then becomes

y = ln(2x+3) + ln(x^2+3x+9) + 7ln(x^2+4)

y' = 2/(2x+3) + (2x+3)/(x^2+3x+9) + 14x/(x^2+4)

If my placement of [] is wrong, please feel free to clarify

- cal 2 -
**Geminese**, Wednesday, March 7, 2012 at 2:59pm
Find the derivative of the function

y=ln(2x/x+3)

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