Question

find the product of the following:- (3x-7y) (3x+7y)
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Answer 1

Answer:

9x^2 -49y^2

Step-by-step explanation:

(3x)^2 - (7y)^2 {Identity III}

9x^2 - 49y^2

Answer 2

Step-by-step explanation:

$3x(3x + 7y) - 7y(3x + 7y) \\ 9 {x}^{2} + 21xy - 21yx - 49 {y}^{2} \\ 9 {x}^{2} - 49 {y}^{2}$

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