Given $f(x)=x^2-2x$

$($A$)$ Find $f^{\text{'}}(x),$

$($B$)$ Find the slopes of the lines tangent to the graph of $f$ at $x=-2,-1,$ and $3$

$($C$)$ Graph f $,$ and sketch in the tangent lines at $x=-2,-1,$ and $3.$

$($A$)f^{\text{'}}(x)=$

$($B$)$ The slope of the tangent line at $x=-2$ is $-6.$

The slope of the tangent line at $x=-1$ is $-4.$

The slope of the tangent line at $x=3$ is $4.$

$($C$)$ Graph f $,$ and sketch in the tangent lines at $x=-2,-1,$ and $3.$

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I need help graphing