1)(7a-1)ˇ2+14a=49aˇ2-14a+1+14a=49aˇ2+1
12ab+(6a-b)ˇ2=12ab+36aˇ2-12ab+bˇ2=36aˇ2+bˇ2
(3a-b)ˇ2-9aˇ2=9aˇ2-6ab+bˇ2-9aˇ2=bˇ2-6ab
4xˇ2-(2x+1)ˇ2=4xˇ2-4xˇ2-4x-1=-4x-1
2)(5a-1)ˇ2+10a=25aˇ2-10a+1+10a=25aˇ2+1
(4+7x)ˇ2-56x=16+56x+49xˇ2-56x=49xˇ2+16
6ab+(3a-2b)ˇ2=6ab+9aˇ2-12ab+4bˇ2=9aˇ2-6ab+4bˇ2
49xˇ2-(2-7x)ˇ2=49xˇ2-4+28x-49xˇ2=28x-4