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#### DeusAbscondus

##### Active member

- Jun 30, 2012

- 176

**without making errors. Here is one I have got wrong; can someone spot where:**

*factorize*$72x^2(2x^4-1)^2+24x^3.2(2x^4-1)$

$=72x^2(2x^4-1)2+48x^3(2x^4-1)$

$=24x^2(2x^4-1)[3(2x^4-1)+2]$

$=24x^2(2x^4-1)(6x^4-1)$

$\text{But answer given in my text is: }$

$24x^2(2x^4-1)(22x^4-3)$

Can anyone help see the point where I went astray?

thanks kindly,

DeusAbs