Помогите с №6 и №2(в,г)

6 а) [latex]( x-1)^{2} -25=0[/latex] [latex]( x-1)^{2} =25[/latex] [latex]( x-1)=5[/latex] или [latex]( x-1)=-5[/latex] [latex]x=5+1[/latex]           [latex]x=-5+1[/latex] [latex]x=6[/latex]               [latex]x=-4[/latex] б) [latex] (x+2)^{2} -( 2x-1)^{2} =0[/latex] [latex] x^{2}+4x+4 -( 4x^2-4x+1) =0[/latex] [latex] x^{2}+4x+4 - 4x^2+4x-1 =0[/latex] [latex] -3x^{2}+8x+3 =0[/latex] D=[latex]64-4*(-3)*3= 64+36=100 [/latex] [latex] x_{1} = \frac{-8+10}{-6} = \frac{2}{-6} =- \frac{1}{3} [/latex] [latex] x_{1} = \frac{-8-10}{-6} = \frac{-18}{-6} = 3[/latex] 2. [latex]4 x^{2} -( x+1)^{2} =4 x^{2}-( x^{2} +2x+1)=4 x^{2}- x^{2} -2x-1= [/latex][latex]3x^{2}-2x-1[/latex] г) [latex]( x^{2} +2x) ^{2} -( 3x-1)^{2} = x^{4} +4x^3+4 x^{2} -(9 x^{2} -6x+1)=[/latex][latex]x^{4} +4x^3+4 x^{2} -9 x^{2} +6x-1=x^{4} +4x^3 -5 x^{2} +6x-1[/latex]