Find the derivative of `"f"("x")=3"x\ a t\ x"=2.`

Explanation

We have given the function `3x` ,

Then `f(x)=3x`

Now by derivative formula,

`f'(a)=lim_(h->0)(f(a+h)-f(a))/h`

`f'(a)=lim_(h->0)(3(a+h)-3(a))/h`

At `x=a=2`

`f'(2)=lim_(h->0)(3(2+h)-3(2))/h`

`f'(2)=lim_(h->0)(6+3h-6)/h`

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