1) -16x^2+y^2=(y-16x)(y+16x)
2)x^2+6x+9=(x+3)^2
3)18c^2-(2(3c-1))^2=(18c-2(3c-1))(18c+2(3c-1)) =(12c+2)(24c-2)=4(6c+1)(16c-1)
4)(2x-1)^2=(2x-1)(2x-1)
5)(x-1)(x+1)-x(x-2)=0
x^2-1-x^2+2x=0
2x=1
x=0,5
1) -16x^2+y^2=(y-16x)(y+16x)
2)x^2+6x+9=(x+3)^2
3)18c^2-(2(3c-1))^2=(18c-2(3c-1))(18c+2(3c-1)) =(12c+2)(24c-2)=4(6c+1)(16c-1)
4)(2x-1)^2=(2x-1)(2x-1)
5)(x-1)(x+1)-x(x-2)=0
x^2-1-x^2+2x=0
2x=1
x=0,5