Show that (5x + 7y)² - (5x -7y)² = 140xy.
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(5x+7y)^2 - (5x-7y)^2 = 140xy
Step-by-step explanation:
(5x+7y)(5x-7y) - (5x+7y)(5x-7y)
(5x+5x)(7y+7y)
(10x)(14y)=140xy
Hence,proved
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