Answer:
Step-by-step explanation:
[tex]m-\frac{1}{m}=3\\squaring ~both~sides\\(m-\frac{1}{m})^2=3^2\\m^2+\frac{1}{m^2}-2*m*\frac{1}{m}=9\\m^2+\frac{1}{m^2}=9+2=11\\squaring~again\\(m^2+\frac{1}{m^2})^2=(11)^2\\m^4+\frac{1}{m^4}+2*m^2*\frac{1}{m^2}=121\\m^4+\frac{1}{M^4}=121-2=119[/tex]
