Find the product. (x + 7y) (7x − y)

Find the product.

(x + 7y) (7x − y)

Sum

(x + 7y) (7x − y)

= x (7x − y) + 7y (7x − y)

= 7x² − xy + 49xy − 7y²

= 7x² + 48xy − 7y²

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