[tex]\displaystyle\bf\\-12c^{2} -24cb-12b^{2} =-12\cdot(c^{2} +2cb+b^{2} )=-12(c+b)^{2}[/tex]
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[tex]\displaystyle\bf\\-12c^{2} -24cb-12b^{2} =-12\cdot(c^{2} +2cb+b^{2} )=-12(c+b)^{2}[/tex]