factorise 125x³+8 y³
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a^3+b^3=(a+b) (a^2-ab+b^2)
(5x)^3+(2y)^3=
(5x+2y) (25x^2-10 x y+4y^2
(5x)^3+(2y)^3=
(5x+2y) (25x^2-10 x y+4y^2
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