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x2 +y2 =90 and x y =27
than
x2 +y2 +2xy = 90+2*27
(x+y)2. =144
x+y =12
and xy =27
solve equation
so get x =9
and y =3
so x3-y3 = 9^3 -3^3
ans 702
than
x2 +y2 +2xy = 90+2*27
(x+y)2. =144
x+y =12
and xy =27
solve equation
so get x =9
and y =3
so x3-y3 = 9^3 -3^3
ans 702
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