Question

use suitable identities to find the product of the following expression (3x - 9y) ²

Answer 1

Answer:

9x² + 81y² - 54xy

Step-by-step explanation:

(a-b)² = a² + b² - 2ab

Here,. a= 3x. and b= 9y.

(3x - 9y)² = (3x)² + (9y)² - (2×3x × 9y) = 9x² + 81y² - 54xy

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