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## Homework Statement

Find an equation for the line perpendicular to the tangent to the curve y=x^3-4x+1 at the point (2,1).

## Homework Equations

point slope form, m * (-1/m) = -1

## The Attempt at a Solution

Derivate: y+3x^2-4

m=8 at x=2

Tangent line: y=8x-15

Answer: y=-x/8-15

Answer in book, y=-x/8 +

**5/4**

Where'd I go wrong?

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