Math, asked by vigneshsreenikha, 1 year ago

( 7m-5n)^{2} [/tex]-(7m+5n)^[2] [/tex]\

Answers

Answered by Shravani83
3
(7m-5n)² - (7m+5n)²           [.·. a²-b²= (a+b)(a-b) ]
⇒ (7m-5n+7m+5n) (7m-5n-7m-5n)         [ 7m and 5n gets cancelled ]
⇒ (14m) (-10n)
⇒ -140mn
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