Question 52880
solve x^-2 = 4.

Just follow the simple rules of algebra.
:
Negative exponent involves the reciprocal:  x^-2  =  1/x^2
:
1/x^2  = 4
:
Get rid of x^2 in the denominator; mult equation by x^2 resulting in:
  1 = 4x^2
:
Divide both sides by 4 resulting in:
1/4 = x^2
:
Or we can say:  x = SqRt[1/4]
;
x = 1/2;