## ksaimouli (x^2-2)(x^-1+1) use the derivative one year ago one year ago

1. mathslover

You mean to find : $$\large\frac{d}{dx}\frac{(x^2-2)}{(x^{-1}+1)}$$ ?

2. ksaimouli

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3. ksaimouli

i am stuck here

4. mathslover

is it $$-2x^3$$ ?

5. Yahoo!

Lol...Didnt get ur Question Can u Write in Latex

6. ksaimouli

no the question is write the expression as a sum of power of x

7. mathslover

What does that sum power mean actually?

8. ksaimouli

i dont know but the answer is x+x^2-2x^-1-2

9. mathslover

OK so it is easy : $\large{(x^2-2)(x^{-1}+1)}$ $\large{x+x^2-2x^{-1}-2 = x-x^2-\frac{2}{x}-2}$

10. mathslover

oops sorry there is x + x^2 - 2/x - 2

11. ksaimouli

so just expand it?

12. mathslover

yep

13. ksaimouli

thx

14. mathslover

you're always welcome @ksaimouli