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Question Number 40664 by Tawa1 last updated on 25/Jul/18

Factorise:     x^(19)  − x^(17)  + x^(10)  + x^8  + 1

$$\mathrm{Factorise}:\:\:\:\:\:\mathrm{x}^{\mathrm{19}} \:−\:\mathrm{x}^{\mathrm{17}} \:+\:\mathrm{x}^{\mathrm{10}} \:+\:\mathrm{x}^{\mathrm{8}} \:+\:\mathrm{1} \\ $$

Answered by ajfour last updated on 26/Jul/18

 = (x^(10) −x^9 +1)(x^9 +x^8 +1)

$$\:=\:\left({x}^{\mathrm{10}} −{x}^{\mathrm{9}} +\mathrm{1}\right)\left({x}^{\mathrm{9}} +{x}^{\mathrm{8}} +\mathrm{1}\right) \\ $$

Commented by Tawa1 last updated on 26/Jul/18

Please any workings sir ???.

$$\mathrm{Please}\:\mathrm{any}\:\mathrm{workings}\:\mathrm{sir}\:???.\: \\ $$

Commented by ajfour last updated on 26/Jul/18

difficult explaining..!

$${difficult}\:{explaining}..! \\ $$

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