X+y=7, XY=10 then find the value of 1/xcube+1/ycube=?
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x+y=7
xy=10
[1/x+1/y]^3
Using (a+b)^3=a^3 +b^3+3ab(a+b)
(1/x+1/y)^3= (1/x)^3 +(1/y)^3 + 3*1/x*1/y(1/x+1/y)
= 1/x^3 .................. .....................
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