Question

(ii) (x + 7y) (7x - y)​

Answer 1

Answer:

$7x^2 + 48xy - 7y^2$

Step-by-step explanation:

$(x + 7y) (7x - y)​\\= x(7x - y) + 7y(7x - y)\\= (7x^2 - xy) + (49xy - 7y^2)\\= 7x^2 + xy(-1 + 49) - 7y^2\\= 7x^2 + 48xy - 7y^2$

Answer 2

Answer:

(x + 7y) (7x – y)

⇒ x(7x – y) + 7y (7x – y)

⇒ 7x²– xy + 49xy – 7y²

⇒ 7x² – 7y²+ 48xy

(x + 7y) (7x – y) = 7x²– 7y² + 48xy

Step-by-step explanation:

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