Hello, Dragon!
Another approach . . .
If and ,
find the numerical value for
We are given: .
Square (1): .
. . . . . . . . .
. . . . . . . . . - -
Substitute (2): .
Cube (1): .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
Substitute (3) and (1): .
Therefore: .