# c3 product ruleWatch

#1
i manage to differenciate using the product rule but when i get to the end its the factorising that gets me, is there any method to factorising these derivatives??
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10 years ago
#2
Err, look for a common factor?
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10 years ago
#3
Can you give an example?

If you mean something like this:

The trick is spotting a common factor. in this case it is So if we factor that out from our derivative:

=

=

= and you're done.
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#4
(Original post by zrancis)
Can you give an example?

If you mean something like this:

The trick is spotting a common factor. in this case it is So if we factor that out from our derivative:

=

=

= and you're done.
well i have 18x^2(1+3x^2)^2+2(1+3x^2)^3
and i cannot seem 2 factorise it
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10 years ago
#5
You can take out a factor of
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#6
ok then so can u show me the steps to differenciating this using the product rule x^3(2x+6)^4 ??
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10 years ago
#7
See that . Therefore Do you want to have a go at factorizing that?
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#8
(Original post by Lusus Naturae)
See that . Therefore Do you want to have a go at factorizing that?
ah, yes i understand it now thanks
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