5.4a+ 1=25 (because the square root is 5), and a = 6.

6. The square root is the reciprocal, so

(m+ 1)+(m-3)=0，m= 1

7. 1.2 * 1.2 = 1.44m = 2

8. When x = 4, the arithmetic square root is1;

When x=-4, the arithmetic square root is 3.