The productof (x+7y)(7x-y) is

7 x^{2} + 48 x y - 7 y^{2}

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7 x^{2} - 48 x y - 7 y^{2}

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7 x^{2} + 48 x y + 7 y^{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

7 x^{2} - 48 x y + 7 y^{2}

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Solution

The correct option is A $7 x^{2} + 48 x y - 7 y^{2}$
(ii) $(x + 7 y) (7 x - y) = x (7 x - y) + 7 y \times (7 x - y)$
$= x \times 7 x - x \times y + 7 y \times 7 x - 7 y \times y$
$= 7 x^{2} - x y + 49 x y - 7 y^{2}$
$= 7 x^{2} + 48 x y - 7 y^{2}$

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(x + 7 y) (7 x - y)

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Find the product.

(i) $(5 - 2 x) (3 + x)$ (ii) $(x + 7 y) (7 x - y)$

(iii) $(a^{2} + b) (a + b^{2})$ (iv) $(p^{2} - q^{2}) (2 p + q)$

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