Question

Find the following products using Identity-III.
(i)
(2x + 7y) (2x – 7y)​

Answer 1

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Answer 2

Answer:

$(2x + 7y)(2x - 7y) \\ using \: identity \: (a + b)(a - b) = {a}^{2} - {b}^{2} \\ {(2x)}^{2} - {(7y)}^{2} \\ 4 {x}^{2} - 49 {y}^{2}$

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