You can put this solution on YOUR website! If what's inside a square root can be factored into a perfect square times another number, that square root can be simplified:
Going further, square roots in the denominator are usually not acceptable, so they are eliminated by multiplying numerator and denominator by something so the denominator product will not have any square roots. (We call that rationalizing).
Finally, we simplify a bit more, by performing the indicated operations where possible:
