a) \({\left( {x + 1} \right)^2} - {y^2} = \left( {x + 1 + y} \right)\left( {x + 1 - y} \right)\)
b) \({x^3} + 3{x^2} + 3x + 1 = {\left( {x + 1} \right)^3}\)
c) \(8{x^3} - 12{x^2} + 6x - 1 = {\left( {2x} \right)^3} - 3.{\left( {2x} \right)^2}.1 + 3.2x.1 - {1^3} = {\left( {2x - 1} \right)^3}\)