[tex]4x^{2} -4y^{2} =4(x^{2} -y^{2} )=4(x+y)(x-y)=4(2,8+2,2)(2,8-2,2)=4*5*0,6=20*0,6=12[/tex]
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[tex]4x^{2} -4y^{2} =4(x^{2} -y^{2} )=4(x+y)(x-y)=4(2,8+2,2)(2,8-2,2)=4*5*0,6=20*0,6=12[/tex]