-sqrt(x)=64 is the same as: sqrt(x) = -64
  
 Solve for x:
 -sqrt(x) = 64
  
 Multiply both sides by -1:
 sqrt(x) = -64
  
 Raise both sides to the power of two:
 x = 4096
  
 -sqrt(x) ⇒ -sqrt(4096) = -64:
 So this solution is incorrect
  
 The solution is incorrect:
 Answer: |(no solutions)