Question

Rationalize the denominator of the following

a) 1 /√5 -√4

b) 2 / √11 - √9

c) 6 / √21 - √ 19

Answer 1

Answer:

A) 1/√5-√4

1/√5-2

1/√5-2*√5+2/√5+2

√5+2/5-4

√5+2/1

B) 2/√11-3

2/√11-3*√11+3/√11+3

√11+3

C). 6/√21-√19

6/√21+√19*√21-√19/√21-√19

6(√21-√19)/21-19

3(√21-√19)