factorise 64 x cube + 125 y cube minus 64 Z Cube + 240 x y z
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64x^3+125y^3-64z^3+240xyz
=(4x)^3+(5y)^3+(-4x)^3-3(4x*5y*-4x)
=(4x+5y-4z)(16x^2+25y^2+16z^2-20xy+20yz+16xz)
=(4x)^3+(5y)^3+(-4x)^3-3(4x*5y*-4x)
=(4x+5y-4z)(16x^2+25y^2+16z^2-20xy+20yz+16xz)
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