factorise 8xcube + 27ycube
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8x³+27y³
[2x]³+[3y]³
use identity a³+b³= [a+b] [a²+b²-ab]
[2x+3y] [4x²+9y²-6xy]
[2x]³+[3y]³
use identity a³+b³= [a+b] [a²+b²-ab]
[2x+3y] [4x²+9y²-6xy]
Anonymous:
i did it first
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