find (x-y)3 +(y-z)3 + (z-x)3
find x+1/x if x2 +1/x2=34
factorise x2-y2x-y
find the value of x3+y3+12xy - 64 when x+y=4
if x and y are two positive real numbers such that x2 - 4y2=40 xy=6 find x+2y
if abc are all nonzero and a+b+c=0 prove that a2/bc+b2/ac+c2/ab=3
(m+2n)2+101(m+2n)+100