Math, asked by pratyoosh3, 1 year ago

factorisation of z^2+1/z^2-2z-2/z​

Answers

Answered by shradh36
1

Answer:

HERE IS UR ANSWER:-

= z⁴-2z³-2z+1/2z

Answered by plrohit2008
0

Answer:

(z + \frac{1}{z} - 2) (z + \frac{1}{z})

Step-by-step explanation:

[FIRST SQUARE (z + \frac{1}{z}) USING IDENTITY ]

(z + \frac{1}{z})² = z² + \frac{1}{z^{2} } + 2

[NOW (- 2z - \frac{2}{z}) IS MISSING, SO ADD THEM BOTH THE SIDES]

⇒ (z + \frac{1}{z}) × (z + \frac{1}{z})  - 2z - \frac{2}{z} =  z² + \frac{1}{z^{2} } + 2 - 2z - \frac{2}{z}

⇒ (z + \frac{1}{z}) × (z + \frac{1}{z})  - 2 (z + \frac{1}{z} ) = z² + \frac{1}{z^{2} } + 2 - 2z - \frac{2}{z}

[ HERE z + \frac{1}{z} AND - 2 ARE COMMON]

⇒ (z + \frac{1}{z} - 2) (z + \frac{1}{z}) = z² + \frac{1}{z^{2} } + 2 - 2z - \frac{2}{z}

HENCE FACTORS OF  z² + \frac{1}{z^{2} } + 2 - 2z - \frac{2}{z} ARE ⇒

(z + \frac{1}{z} - 2) (z + \frac{1}{z})

THANK YOU

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