Help!Plz!!very urgent!! (1 Viewer)

[linxicm]

Can anyone help me with this question? first derivative for :

f(X)=1/(X*LnX^2)

and


f(x) = 98+5x/(3x^2+1)

many tks!!!

 

[lolokay]

using quotient rule: d/dx u/v = (v.du - u.dv)/v²
ln[x²] = 2lnx
d/dx 1/(2x ln[x])
= -(2ln[x] + 2)/(2x ln[x])²
= -(ln[x] + 1)/4x²lnx

d/dx (98+5x)/(3x² + 1)
= ( 5(3x² + 1) - 6x(98+5x) )/((3x² + 1)²
= ( -15x² - 588x + 5 )/(3x² + 1)²


there's a derivative solver here: http://calc101.com/webMathematica/derivatives.jsp#topdoit

 

[lolokay]

wow, good question =/
"4U MATH: 94"

 

[vds700]

Can anyone help me with this question? first derivative for :

f(X)=1/(X*LnX^2)

and


f(x) = 98+5x/(3x^2+1)

many tks!!!

why u asking this if u did ure hsc 3 years ago?