2
$\begingroup$

I can't identify how line 1 has simplified to line 2 in this equation. I've been staring at this for quite a while, but nothing has come to me yet. I think it's just the numerator that is confusing me, since the denominator's powers cancel nicely. I think they have divided by 3 and multiplied by something similar to $2(5x+3)^{-1}$. I just can't see what!

How did they get from line 1 to line 2?

Can anyone give me any hints? Many thanks!

  • 0
    Right. (filler)2011-04-14

1 Answers 1

2

They have taken a factor of $3(5x+3)^{-\frac{1}{2}}$ out of the numerator, and simplified the denominator.

If you find yourself at a situation like line 1, think to yourself:

  • What can be simplified in the numerator and/or denominator?
  • What is common to the numerator & denominator?
  • What factors can I take out from numerator?