Question

Please answer my question mentioned above

Answer 1

x-y=4
x³-y³=316
 
(x-y)³=x³-y³-3xy(x-y)

4³=316-3xy(4)

64=316-12xy

-252=-12xy

i) xy=252/12
      =21

(x-y)²=x²-2xy+y²

  4²=x²+y²-42

 16=x²+y²-42

ii) x²+y²=58