Arrange the following District in decreasing order in

If x⁴ + x ^{- 4} = 47 then find the value of (x + x^-1).

If both the roots of x ²  + kx + 49 = 0 are real and equal, then find the value of 'k'.

If x −y =4and xy =45,thenthevalueof x ³ −y³is:

‘a’ is directly proportional to ‘b’. If at a=30, the value of ‘b’ is 20% greater than ‘a’, then find the value of ‘a’ when b=54.

If 9x² + 16y² = 24xy, then find the ratio of ‘x’ and ‘y’, respectively.

If x:y:z = 3:4:6, and (5x + 3z) = 132, then find the value of '3y'.

If (Ax + By - Cz) ²  = 4x ²  + 3y ²  + 2z ²  + 4√3xy - 2√6yz - 4√2xz, then find the value of A