Using the power rule, find ddx[1x4]\frac{d}{dx}\left[\frac{1}{x^4}\right]dxd[x41].
−4x5-\frac{4}{x^5}−x54
4x5\frac{4}{x^5}x54
−14x3-\frac{1}{4x^3}−4x31
−4x3-\frac{4}{x^3}−x34