5 more than twice the cube of a number The phrase a number means an arbitrary variable, let's call it x: x The cube of a number means we raise x to the power of 3: x^3 Twice the cube means we multiply x^3 by 2 2x^3 Finally, 5 more than twice the cube means we add 5 to 2x^3: 2x^3 + 5
