Question

if m-1/m=5 find :- m²-1/m²​

Answer 1

Explanation:

First of all, the sign of the equation which you have given is incorrect.

It will be m^2+1/m^2

then,

(m-1/m)^2=m^2+1/m^2-2

5^2=m^2+1/m^2-2

25+2=m^2+1/m^2

27=m^2+1/m^2

Answer 2

Explanation:

m-1 / m = 5

m-1 = 5m

-4m = 1

m = -1/4

m^ 2 = 1/16

now

m^2 - 1 = 1/16 - 1 = -15/16

m^2 - 1 / m^2 =( -15/16 )/ (1/16)

= -15