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Find the product. (i) (5 − 2x) (3 + x) (ii) (x + 7y) (7x − y)

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Find the product.

(i) (5 − 2x) (3 + x) 

(ii) (x + 7y) (7x − y)

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(i) (5 − 2x) (3 + x) 

= 5 (3 + x) − 2x (3 + x)

= 15 + 5x − 6x − 2x2

= 15 − x − 2x2

(ii) (x + 7y) (7x − y) 

= x (7x − y) + 7y (7x − y)

= 7x2 − xy + 49xy − 7y2

= 7x2 + 48xy − 7y2

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