Question

please answer this question of class 9 maths please please please please help me####q23,24​

Answer 1

Answer:

Step-by-step explanation:

given a=7+4√3 then 1/a=7-4√3 now (√a+1/√a)^2=a+1/a+2=7+4√3+7-4√3+2=16 so (√a+1/√a)=±4