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Multiplication of Any Polynomial

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Question

Find the product :
$(7 a - 5 b) (49 a^{2} + 35 a b + 25 b^{2})$

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Solution

$(7 a - 5 b) (49 a^{2} + 35 a b + 25 b^{2})$
$= (7 a - 5 b) ((7 a)^{2} + 7 a \times 5 b + (5 b)^{2})$
$= (7 a)^{3} - (5 b)^{3}$
$= 343 a^{3} - 125 b^{3}$

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