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C2 co-ordinate geometry urgent help needed watch

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    Hi I really need help with this question. Thanks in advance
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    You could start by finding the gradient of the line which goes from the center of the circle to the point (7,-10), as the tangent will be perpendicular to this line.
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    (Original post by Meggy moo 1)
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    Hi I really need help with this question. Thanks in advance
    Look at Solution Bank:

    http://www.physicsandmathstutor.com/...ann-textbooks/

    I don't remember doing that question last year. They would have to give you the equation of the line unless they want you to differentiate that (which requires C3 and C4 knowledge)
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    All you have to do, is find the coordinates of S and T and then make a little sketch - the traigbel formed will be a right angled triangle, formed by the origin and the points S and T.
 
 
 
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