Question

solve this for 35 points

Answer 1

Step-by-step explanation:

15)4/√11-√7*√11+√7/√11+√7

4(√11+√7)/4

=√11+√7

17)a=√2-1

(a-1/a)^3

1/a=1/√2-1*√2+1/√2+1=√2+1

a-1/a=√2-1-√2-1

(a-1/a)=-2

(a-1/a)^3=(-2)^3=-8

Answer 2

Step-by-step explanation:

Refer to the attachment...