The function is
and the point is
.
Differentiate the function with respect to
.

Apply power rule of derivatives :
.

At the point
,
.
This is the slope of the tangent line.
\Slope of the tangent line is
.
Point-slope form of the line equation is
, where
is slope.
Substitute
and
in point-slope form.

The tangent line equation is
.
Use the linear approximation to complete the table.
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The table compares the values of
given by linear approximation with the values of
near
.
The tangent line equation is
.
The completed table :
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