인수 분해:x2-9a 2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y4 8a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12

인수 분해:x2-9a 2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y4 8a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12

x2-9a2+12a-4=x2-[(3a)2-2*3a*2+4]=x2-(3a-2)^2=(x+3a-2)(x-3a+2)x2y+3xy2-x-3y=xy(x+3y)-(x+3y)=(xy-1)(x+3y)1-x2-2xy-y2=1-(x+y)^2=(1+x+y)(1-x-y)3a2+2b-2ab-3a=3a(a-1)-2b(a-1)=(3a-2b)(a-1)x2+y2+2xy+ax+ay=...