Math, asked by Aishna005, 1 year ago

Why (x-1/x)^2= x^2+1/x^2-2?? Why there -2 at the last? Please answer this. Exam today.

mrina: in identity (a-b) equal to a^2+b^2-2ab. in this equation x×1/x will be cancel out by which equation will be x^2+1/x^2-2

Aishna005: Thanks ❤❤

mrina: :)

mrina: best of luck

mrina: for exam

Anonymous: Yeah, best of luck, Aishna!

Answers

Answered by brunoconti

Answer:

Step-by-step explanation:

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Attachments:

Aishna005: Alright. I get it! Thanks ❤❤

brunoconti: anytime

Answered by Anonymous

$(x - \frac{1}{x} ) {}^{2} \\ \\ = x {}^{2} + \frac{1}{ {x}^{2} } - 2 \: (x) \: ( \frac{1}{x} )$

(a - b)² = a² + b² - 2 a b.

The x'es get cancelled, rendering a -2 there.

Aishna005: Thanks a lot!! ❤❤

Anonymous: :)

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