HELP! Anyone who knows calculus please come here!

<p>Okay, given g(2)=-4 and g'(x)= sqrt.(x^2+5),
find the linear approximation of g(1.95) and g(2.05)</p>

<p>please explain this to me!</p>

<p>actually, i figured it out. but if you want to challenge yourself, go ahead and do the problem!</p>