[tex]\displaystyle\bf\\4a^{2} +4a+1=(2a)^{2} +2\cdot 2a\cdot 1+1^{2}=(2a+1)^{2} =(2a+1)(2a+1)[/tex]
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[tex]\displaystyle\bf\\4a^{2} +4a+1=(2a)^{2} +2\cdot 2a\cdot 1+1^{2}=(2a+1)^{2} =(2a+1)(2a+1)[/tex]