Please help, medal and fan! question in picture below

Question

anonymous · Answer

attachment

anonymous · Answer

its very simple, question but first i need to know what you have tried about this question, and why you don't find the answer.

anonymous · Answer

@pingdongoll

sweetburger · Answer

Start by changing everything to the reciprocal (if that makes sense).

jhonyy9 · Answer

1       1           1
--- - ---- = ----     ,  a*b = sqrt(c)  , c>0  and a<b   , then average value of a and b ? 
a^2     b^2      c                                                                                                            


A. 1/2
B  1/2(b-a)
C. (b-a)/2
D. None of these 

b^2 -a^2            1
----------- = ----
  a^2 *b^2           c

b^2 -a^2          1
---------- = ----
      c                 c

(b-a)(b+a)            1
------------ = ----
     c                     c

b^2 -a^2 = 1

b^2 = 1 + a^2

i have got this - but i dont know than will help you

anonymous · Answer

Sorry guys, I got help from my teacher. The correct answer is b.