\

b) The expression is \"image\"

\

Differentiating above equation with recept to x.

\

\"image\"

\

\"image\"

\

The normal line to the curve at \"image\".

\

\"image\"

\

\"image\"

\

\"image\"

\

\"image\"

\

\"image\"

\

The equation of the normal line  \"image\"and the point \"\".

\

The point -slope form of equation of a line :  \"image\", where m = slope.

\

\"\"

\

\"\"

\

\"\"

\

The equation is \"\"

\

.

\