Question

expand (2x-1/x)^2 by using algebraic indentity​

Answer 1

Answer:

(2x-1/x)² = (2x)² - 2(2x)(1/x) + (1/x)²

= 4x² - 4 + 1/x²

= 4x² - 4 + x^-2

Sum of powers = 2+0-2

= 0

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