Let $f(x)=\frac{1}{3}{x}^3-\frac{3}{2}{x}^2-40x2$

a$.$ Find all volues of $x$ on the graph of $f$ at which the tangent line is horizontal.

b$.$ Find all values of $x$ on the graph of $f$ at which the tangent line has slope of $-22.$

No quadratic formulac. $f(x)=(4x-5)(7x^{2}2)$

d$.y=\frac{32x^7-12x^5-2x-5}{4x^2}$

e$.y=\frac{2x-18}{\sqrt[\phantom{2}]{x}-3}$

f$.h(x)=\frac{3x^{4}12x^3-63x^2}{x^{3}7x^2}$