Question

( 7mn +1) ( 7mn-1) solve it


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Answer 1

$(7mn + 1)(7mn - 1) \\ \\ = ( {7mn)}^{2} - ( {1)}^{2} \\ \\ = 49 {m}^{2} {n}^{2} - 1$

I hope this helps you.

Answer 2

Answer:

49(mn)²-1.

Step-by-step explanation:

Given,

(7mn+1) (7mn-1) => (7mn)²-(1)²

As, (a+b)(a-b) = a²-b²

=> 49(mn)² - 1.

=> 49m²n²-1

Hope it helps you...