Question 26357
why x? we use any old letter we care to. Just so happens x is the most common. No reason you need know about :-)


As for your specific questions, i recommend you read through my Lessons on this website and those of rapaljer. Together, I think we cover most topics and we are clear in our help.


5x(3-9x)+4-x
{{{15x-45x^2+4-x}}}
{{{14x-45x^2+4}}}
{{{4+14x-45x^2}}}


jon.