Answer & Explanation
Consider the given function:
Now differentiate the function to find the slope.
Now find the slope at given point (81,9).
Write the equation for a line.
Put the values of known quantities.
Then, by Eq. 3, the slope of the tangent at
Using the point-slope form of the equation of a line, we find that an equation of the tangent at the point
Which simplifies to
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