factorise: 125x^3 + 27y3
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125x³+27y³
=>(5x)³+(3y)³
We know that a³+b³= (a+b)(a²-ab+b²)
=>(5x+3y)[(5x)²-5x×3y+(3y)²]
=>(5x+3y)(25x²-15xy+9y²)
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