factorise 125x^3 +27y^3+8z^3-90xyz
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125x³+27y³+8z³-90xyz
{a³+b³+c³-3abc=(a+b+c)(a²+b²+c²-ab-bc-ca)}
=> a=5x,b=3y,c=2z
125x³+27y³+8z³-90xyz=
(5x+3y+2z)(25x²+9y²+4z²-15xy-6yz-10zx)
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