4 Rationalize the denominator Tip multiply by a form of 1 Case 1 denominator is a monomial multiply the numerator and denominator by the nth root of factors that produce nth powers of all the factors in the radicand of the denominator Case 2 denominator is a binomial multiply the numerator and the denominator of the fraction by the conjugate of the denominator 5 Simplify each expression a 2 V7 VII Examples 1 a b 515 2 2 3 5 3 5 3 5 3 5 3 2 10 3 2 10 9 5 4 b 2 9 3 10 5