" 6.If "a^(2)+(1)/(a^(2))=102," find the value of "a-(1)/(a)

If a^2 + 1/a^2 = 102 , then find the value of a - 1/a

By using the a^(2)-b^(2), find the value of (1.02)^(2)-(.98)^(2).

If A = [(1,0,2),(0,2,1),(2,0,3)] "and" " "A^(3)-6A^(2)+7A+kI=0, find the value of k.

If x + 1/x =99 , find the value of (100x)/(2x^2 + 102x +2)

If [(1,0,0),(2,0,1),(1,0,2):}][(0),(2),(x):}] = 0 find the value of x.

If [(1,2,1)][(1,2,0),(2,0,1),(1,0,2)] [(0),(2),(x)] = 0 , then the value of x is

If A=[(1,0,2),(-1,1,-2),(0,2,1)]" and Adj "A=[(5,a,-2),(1,1,0),(-2,-2,b)] , then the values of a and b are -