factorise (i) x^3 - 0.216
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x^3 - 0.216
= x^3 - ( 216/1000)
= (x)^3 - (6/10)^3
= (x)^3 - (3/5)^3
= (x - 3/5)(x^2 + 3x/5 + 9/25)
= x^3 - ( 216/1000)
= (x)^3 - (6/10)^3
= (x)^3 - (3/5)^3
= (x - 3/5)(x^2 + 3x/5 + 9/25)
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