exam Maths Puzzle Numerical Ability

two square root of x+1 is equals to sqare root of x+2

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Please help me to solve following
(n-1)
E [(n-m+1)(n-m) + (n-m)]
(m=1)
I am using E for sigma sign.

B. Chakraborty a a+b
- + ---
b a-b
_______
a a-b
- - ---
b a+b
In other terms:
[(a/b)+(a+b)/(a/b)]/[(a/b)-(a-b)/(a+b)]

I tried to multiply both denominator and numerator by [b(a+b)(a-b)}] but that didnt seem to work for me.