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    in coordinate geometry in problems involving tangents to parabolas what is the normal and why does it have a negative reciprocal gradient?fp1 further matsh edexcel
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    (Original post by youreanutter)
    in coordinate geometry in problems involving tangents to parabolas what is the normal and why does it have a negative reciprocal gradient?fp1 further matsh edexcel
    It's a line that makes 90 degrees to the tangent, and you use what you've learned in the past that the product of the two gradients is -1.
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    (Original post by SeanFM)
    It's a line that makes 90 degrees to the tangent, and you use what you've learned in the past that the product of the two gradients is -1.
    so does the normal goe through the two tangents at a given point as its symmetrical?thanks btw
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    (Original post by youreanutter)
    so does the normal goe through the two tangents at a given point as its symmetrical?thanks btw
    Two tangents? I'm not sure what you mean. There should only be one tangent at a given point.
 
 
 
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