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ICSE Class 9 Answered

Find xy, if x + y = 6 and x – y = 4.
Asked by Brainy | 07 Feb, 2019, 11:26: AM
answered-by-expert Expert Answer
(x+y)2 - (x - y)2 = 4xy
 
or xy = (1/4) [ ( x+y)2 - (x-y)2 ] = (1/4) [ 62 - 42 ] = 5
Answered by Thiyagarajan K | 07 Feb, 2019, 12:59: PM

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