find the product using identities (5x -9) (5x -9) – InterviewSolution

1.

find the product using identities (5x -9) (5x -9)

Answer»

Use (a-b) ( a-b) = (a-b)² = a² + b² - 2ab

(5x-9) (5x-9) = (5x-9)²

= (5x)² + 9² - 2 × (5x) × 9

= 25x² + 81 - 90x

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