How do you know to multiply it by x^2? Is there a rule or something to follow?
Thanks
Since there is an $\displaystyle x^2$ on the bottom of the fraction, to get it to disappear and have a simpler equation to work with, you multiply every term by it.
Since there is an $\displaystyle x^2$ on the bottom of the fraction, to get it to disappear and have a simpler equation to work with, you multiply every term by it.
Of course it is, I was thinking that it was x not x^2.. Sometimes I swear my brain isn't switched on!