Factorise::: Class 9th
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Step-by-step explanation:
Given that,
z² + 1 / z² - 2 - 3z + 3 / z
= ( z² + 1 / z² - 2 × z × 1/z ) - (3z + 3 × 1/z )
= ( z - 1/z )² - 3 ( z + 1/z ) is the answer.
( ∵ 2 × z × 1/z = 2)
( ∵ a² + b² - 2ab = ( a - b )², Here , a = z and b = 1/z )
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