Вычисли

1. \(\sqrt{7^2+2\cdot 4^2}=\) [ ].
2. \(\sqrt{8^2-3\cdot 4^2}=\) [ ].
3. \(\sqrt{4^2}-\sqrt{7^2}=\) [ ].
4. \(\sqrt{(-5)^2}+\sqrt{(-4)^2}=\) [ ].