Let us say we have this:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]f(x)=(x^3-x)(x^2+2)(x^2+x-1)[/tex]

Would it be equally correct to multiply the first two binomials, and then taking that and multiplying by the last tri-nomial; and then using the sum rule? It seems perfectly fine (and much simpler!) but I want to make sure I am not violating anything here. It seems like a longer problem to use the product rule twice.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Using sum difference derivative instead of prodict rule?

**Physics Forums | Science Articles, Homework Help, Discussion**