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# Factorising Product rule watch

1. Can someone help me factorise this please confused

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2. (Original post by Abby5001)

Can someone help me factorise this please confused

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I mean no offence by this, but perhaps it would be a good idea for you to practice factorising complicated things, as that seems to be where you're having trouble rather than stuff to do with the product rule / differentiation.

But similar to previous threads, if you set u = (2x+1) and rewrite everything you may be able to see how to factorise it more clearly.

Or even better .. (2x+1)^1/2 but without substituting the x as it's more simple that way.
3. (Original post by SeanFM)
I mean no offence by this, but perhaps it would be a good idea for you to practice factorising complicated things, as that seems to be where you're having trouble rather than stuff to do with the product rule / differentiation.

But similar to previous threads, if you set u = (2x+1) and rewrite everything you may be able to see how to factorise it more clearly.
I've done that and it's no clearer to me

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4. (Original post by SeanFM)
I mean no offence by this, but perhaps it would be a good idea for you to practice factorising complicated things, as that seems to be where you're having trouble rather than stuff to do with the product rule / differentiation.

But similar to previous threads, if you set u = (2x+1) and rewrite everything you may be able to see how to factorise it more clearly.
Doesn't matter I understand now

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5. (Original post by Abby5001)
I've done that and it's no clearer to me

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Okey dokey, no worries

Kind of cheating here by leaving the x as it is in a substitution, but that'd just make it more confusing.

If u = (2x+1)^(1/2)

Then

And if you factor out u^-1 from both terms, using that u = u^2 * u^-1 you get 3u^-1 (x + u^2) and then put things back in.

I may have mislead you by suggesting u = 2x+1 rather than (2x+1)^(1/2), sorry!

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Updated: November 10, 2015
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