Calculus

In order to find the tangent line, you'll need the gradient of f(x). Do you know how to do this?
 
Which question are you asking about? I'll assume (a).

Begin where they say to begin! What is the slope of the tangent line at the indicated point? Then write the equation of that line, and use that as an approximation to the function f.
 
You might want to start by taking a Calculus course so you will know how to find a "tangent line" to a curve. It sounds like you haven't yet.
 
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