Question

Use linear approximation, i.e. the tangent line, to approximate sqrt64.4 as follows:
Let . f(x)=sqrtxThe equation of the tangent line to x=64 at can be written in the form y=mx+b where m is: ??
Using this, we find our approximation for sqrt64.4 is
NOTE: For this part, give your answer to at least 9 significant figures or use fractions to give the exact answer.