Factorise: 8x cube + 1/27y cube +4x + 2/3x
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8x³+1/27y³+4x+2/3y
= [(2x)³+(1/3y)³]+2(2x+1/3y)
= [(2x+1/3y)((2x)²–(2x)(1/3y)+(1/3y)²)]+2(2x+1/3y)
= (2x+1/3y)(4x²–2x/3y+1/9y²+2)
= [(2x)³+(1/3y)³]+2(2x+1/3y)
= [(2x+1/3y)((2x)²–(2x)(1/3y)+(1/3y)²)]+2(2x+1/3y)
= (2x+1/3y)(4x²–2x/3y+1/9y²+2)
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