[tex]\displaystyle b^3-8c^3=b^3-2^3c^3=b^3-(2c)^3=(b-2c)(b^2+b*2c+(2c)^2)=\\(b-2c)(b^2+2bc+4c^2)[/tex]
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[tex]\displaystyle b^3-8c^3=b^3-2^3c^3=b^3-(2c)^3=(b-2c)(b^2+b*2c+(2c)^2)=\\(b-2c)(b^2+2bc+4c^2)[/tex]