suppose x+1/x =3. evaluate x^3 + 1/x^3
I started by cubed both sides and now im lost. please help
1) Start with the equation x + 1/x = 3
Multiply both sides by x, giving you a quadratic.
Solve this quadratic (use the quadratic formula).
2) Take each of the two answers from part 1) and place them into the expression: x3 + 1/x3