1)(x+5)(x+5)-(x-1)(x-1)=48

[latex](x+5)(x+5)-(x-1)(x-1)=48[/latex] [latex](x+5)^2-(x-1)^2=48[/latex] [latex] x^{2} +10x+25-( x^{2} -2x+1)=48[/latex] [latex] x^{2} +10x+25-x^{2} +2x-1=48[/latex] [latex]12x+24=48[/latex] [latex]12x=48-24[/latex] [latex]12x=24[/latex] [latex]x=24: 12[/latex] [latex]x=2[/latex] Ответ:  [latex]2[/latex]