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DeusAbscondus
Active member
- Jun 30, 2012
- 176
I am finding product rule problems difficult.Trying to find the second derivative makes them explode into unweildly equations that are hard to deal with and factorize without making errors. Here is one I have got wrong; can someone spot where:
$72x^2(2x^4-1)^2+24x^3.2(2x^4-1)$
$=72x^2(2x^4-1)2+48x^3(2x^4-1)$
$=24x^2(2x^4-1)[3(2x^4-1)+2]$
$=24x^2(2x^4-1)(6x^4-1)$
$\text{But answer given in my text is: }$
$24x^2(2x^4-1)(22x^4-3)$
Can anyone help see the point where I went astray?
thanks kindly,
DeusAbs
$72x^2(2x^4-1)^2+24x^3.2(2x^4-1)$
$=72x^2(2x^4-1)2+48x^3(2x^4-1)$
$=24x^2(2x^4-1)[3(2x^4-1)+2]$
$=24x^2(2x^4-1)(6x^4-1)$
$\text{But answer given in my text is: }$
$24x^2(2x^4-1)(22x^4-3)$
Can anyone help see the point where I went astray?
thanks kindly,
DeusAbs