Noelle W.

asked • 10/10/14

Finding formula for a Perpendicular line to a Tangent

Consider the graph of the function f(x)=3x^2-12x+14. What is the graph of the line perpendicular to the tangent line of this graph when x=3? 
Here's what I figured:
6=m in y=mx+b, therefore, the slope of the perpendicular line of the tangent is -1/6.
From here, how can I get the formula for this line? 

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