factorise - x³ /1000 + 27/64
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x³/1000+27/64
= (x/10)³ + (3/4)³
= (X/10+3/4){(X/10)²- X/10.3/4 + (3/4)²}
={ (2x + 15)/20}{x²/100 - 3x/40 + 9/16
= (2x+15)/20{4x²-30x+225/400}
= (2x+15)(4x²-30x+225)/8000
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