Question

a=√10+√5/√10-√5 and b=√10-√5/√10+√5 the show √a-√b-2√ab=0.

Answer 1

Answer:

Step-by-step explanation:

If a > b > 0, then a2−b2−−−−−−√a2−b2

A. a+b−2ab−−−√a+b−2ab

B. a−b+2ab−−−√a−b+2ab

C. (a−b)2−2ab−−−−−−−−−−−√(a−b)2−2ab

D. (a+b−−−−√)(a−b−−−−√)(a+b)(a−b)

E. (a√+b√)(a√−b√)(a+b)(a−b)

What is the difference between D and E

I thought because of the numbers being all under the square root e.g. in D (a+b−−−−√)(a+b)  

that you will have to subtract a from b first giving e.g. answerc√c and for the other one e.g.d√d

And therefore (c√)(d√)(c)(d) a totally different value?