Question

Please help, ik it looks easy but i cant do it, ill give brainliest

Answer 1

Answer:

Step-by-step explanation:

$(m+\frac{1}{m})=3\\cubing both sides\\(m+\frac{1}[m})^{3} =3^{3} \\m^3+\frac{1}{m^3}+3 m*\frac{1}{m}(m+\frac{1}{m})=27\\m^3+\frac{1}{m^3}+3*3=27\\m^3+\frac{1}{m^3}=27-9=18$