3 ms·

It just means you should choose a better calculator From my calculator (Genius Mathematical Tool): genius> sqrt(200)*sqrt(200) = 200.0

• Tichy 13y ago
  Well that is also wrong, or at least the .0 shows that the calculator is not doing the equations, it is just calculating. It doesn't know know that sqrt(2) x sqrt(2) = sqrt(2 x 2) = sqrt(2^2) = 2 And that is the kind of thing you get to understand if you do the calculations by hand.
  • richardwhiuk 13y ago
    A better way to look at sqrt(2) * sqrt(2) is: sqrt(2) * sqrt(2) = 2^(0.5) * 2^(0.5) = 2^(0.5+0.5) = 2^1 = 2
    • Tichy 13y ago
      That's nice, too, although I think the concept of fractional powers was only introduced much later in my school.