Объяснение:
1) 3a^2+6ax+3x^2=3(x^2+2ax+a^2)=3(x+a)^2
2) -10x^2+40xy-40y^2= -10(x^2-4xy+4y^2)= -10(x-2y)^2
3) -a^2-2ax-x^2= - (a^2+2ax+x^2)= - (a+x)^2
4)-1+10a-25a^2= - (25a^2-10a+1)= - (5a-1)^2
Объяснение:
1) 3a^2+6ax+3x^2=3(x^2+2ax+a^2)=3(x+a)^2
2) -10x^2+40xy-40y^2= -10(x^2-4xy+4y^2)= -10(x-2y)^2
3) -a^2-2ax-x^2= - (a^2+2ax+x^2)= - (a+x)^2
4)-1+10a-25a^2= - (25a^2-10a+1)= - (5a-1)^2