If `| [ x-1 , -2 ] , [ x^2 , x + 1 ] |` = 0 , then find the value of x

1/8 -(2x)/4 + 1 = 0 , find the value of x

If 2 ^(x +1) + 2 ^( x-1)= 80, then find the value of x.

If |[1,x,x^2] , [x,x^2,1] , [x^2,1,x]|=3 then find the value of |[x^3-1, 0, x-x^4] , [0,x-x^4, x^3-1] , [x-x^4, x^3-1, 0]|

If ( x + 1 )( x + 4 ) - ( x -2 )( x - 1 ) = 0 , find the value of x

If 2^(x-1)+2^(x+1)=320, then find the value of x.

If |[2,3,2],[x,x,x],[4,9,1]|+3=0 , then find the value of x.

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