Pavel uses a piece of cardboard to create a box. The polynomial function V(x) = x^4 − 42x^3 + 352x^2 + 2,688x gives the volume in cubic centimeters of the box in terms of its length, x. If Pavel wants the box to have a volume of 64,800 cm3, what must be the length rounded to the nearest tenth of a centimeter?

PLEASE ITS FOR A TEST