Упрости выражения

1. \(a^2+(4-a)^2=\) [ ];

2. \((7x-2)^2+28x=\) [ ];

3. \(b^2+100-(b-10)^2=\) [ ];

4. \(2m(m+1)-(m-3)^2=\) [ ];

5. \((x-8)^2-(x-6)(x+6)=\) [ ];

6. \((3x-5)^2-(3x-1)(3x+5) =\) [ ].