$[2/4$ Points$]$

Consider the following function.

$f(x)=7x^3+x^2-0\mathrm{.}07x+14$

Find the two points on the graph at which the tangent line is horizontal. Give your values correct to $2$ decimal places.

$($point with smaller $x$ value$)$

$($point with larger $x$ value$)$