To rationalize the denominator, multiply the numerator and denominator by a radical that will get rid of the radical in the denominator.
sqrt(2)/2
Practice makes perfect
To rationalize a radical expression in the denominator of a fraction, we have to multiply it by a fraction equivalent to 1 such that the resulting denominator is a rational number. Remember that we have to multiply both the numerator and the denominator. Consider the following for any rational numbers a and b.
a/sqrt(b)=a/sqrt(b)*sqrt(b)/sqrt(b)=a sqrt(b)/bIn this case, we have to multiply the given expression by sqrt(18)sqrt(18).
