Answers

2015-06-23T17:03:32+05:30
X³+y³+15xy-123
 
⇒(x+y)³=x³+y³+3xy(x+y)
⇒5³=x³+y³+3xy(5),substituting x+y=5
⇒125=x³+y³+15xy
Substituting the above equation in the gn. equation,
⇒5-123
⇒-118

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By
MASelvam
Booksworm
0
2015-06-24T01:47:55+05:30