Question

(3x+7y)square-(3x-7y) square​

Answer 1

Answer:

(a+b)^2 - (a-b)^2 = 4ab

Here a = 3x and b = 7y

So 4ab = 4 × 3x × 7y

= 84 xy

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Answer 2

Answer:

${a}^{2} - {b}^{2} = (a + b)(a - b) \\ \\ {(3x + 7y)}^{2} - {(3x - 7y)}^{2} = (6x)(14y) = 84xy$