Put parentheses around the numeratior and denominator:Form the conjugate of the denominator by changing the sign of the second term, that is, , put it over itself, , which has value 1. So we may multiply it by the original without changing the value That's what you got but you can simplify it by multiplying by Edwin
Write in simplified radical form by rationalizing the denominator. _(answered by AnlytcPhil)