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September 21, 2014

September 21, 2014

Posted by **George** on Sunday, March 3, 2013 at 9:16am.

I expanded the second bracket using binomial expansion and got 1 -6x +27x^2 -108x^3

how do I combine (x+4) with the expansion?

Any help would be appreciated.

- maths -
**Steve**, Sunday, March 3, 2013 at 1:47pmjust multiply out as usual, taking only the firet 3 terms:

(1 -6x +27x^2 -108x^3)(4+x)

= (1 -6x +27x^2 -108x^3)*4

+ (1 -6x +27x^2 -108x^3)*x

= 4 - 24x + 108x^2 - ...

+ x - 6x^2 + 27x^3 - ...

----------------------------------

4 - 23x + 102x^2 + ...

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