equation of the normal line

What is the equation of the normal line to the curve y = x^2 + 2x - 1 at a point (1,2)



can anyone here do this


thanks

Quote:

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Originally Posted by rcs

What is the equation of the normal line to the curve y = x^2 + 2x - 1 at a point (1,2)



can anyone here do this


thanks

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The tangent line at (1,2) has the same gradient as the curve at the point (1,2). What function tells you the gradient of a curve?

The normal line is perpendicular to the tangent line. What property do perpendicular lines have?