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Expansion of (x^2 - y^2)

Question 2iiF...

Question

Question 2(ii)
Find the product:
(x+7y)(7x-y)

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Solution

$(x + 7 y) (7 x - y) = x (7 x - y) + 7 y \times (7 x - y)$
$= x \times 7 x - x \times y + 7 y \times 7 x - 7 y \times y$
$= 7 x^{2} - x y + 49 x y - 7 y^{2}$
$= 7 x^{2} + 48 x y - 7 y^{2}$

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Expansion of (x^2 - y^2)

Standard VIII Mathematics

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