So the order of operations says you should do the parentheses first, so ignore x for now and use FOIL (first, outer, inner, last) to multiply (x-6) (x-7) firstFOIL means you multiply x times x, then x times -7, then x time -6, and finally -6 times -7 so you get x^2 -7 x-6 x +42 and simplify to x^2 -13 x +42 and then you multiply each part of that by xx (x^2-13 x +42)=x^3 -13 x^2+42 x