factorise 2√2a^ 3+16√2b^3+c^3
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x³+y³+z³+3xyz=(x+y+z)(x²+y²+z²-xy-yz-zx)
x=a√2,y=b√8,z=c
(a√2+b√8+c)(2a²+8b²+c²-4ab-bc√8-ac√2)
x=a√2,y=b√8,z=c
(a√2+b√8+c)(2a²+8b²+c²-4ab-bc√8-ac√2)
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