Question

new challenge to BRAINIEST students​

Answer 1

Answer:

2M^2-1

Step-by-step explanation:

mean of a and b

a+b

_____

2

Answer 2

given

(X + 1/X )2= M

x + 1/x = 2M

in squring both side

x^2 + 1/x^2 + 2 = 4M^2

x^2 + 1/x^2 =4M^2 - 2

(x^2 + 1/x^2)/2 = 2M^2 -1

so

option 3