1)x(3x+5)-1=x(x-4)
3x^2+5x-1=x^2-4x
2x^2+9x-1=0
2)(6x+x)в квадрате=(x-2)(3-x)
(6x+x)^2=36x^2+12x^2+x^2=49x^2=(7x)^2
(7x)^2=3x-x^2-6+2x
49x^2=-x^2+5x-6
50x^2-5x+6=0
1)x(3x+5)-1=x(x-4)
3x^2+5x-1=x^2-4x
2x^2+9x-1=0
2)(6x+x)в квадрате=(x-2)(3-x)
(6x+x)^2=36x^2+12x^2+x^2=49x^2=(7x)^2
(7x)^2=3x-x^2-6+2x
49x^2=-x^2+5x-6
50x^2-5x+6=0