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    can anyone explain q19 p134 of the as maths textbook thank you
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    (Original post by Kazo11)
    can anyone explain q19 p134 of the as maths textbook thank you
    Just post the question, not everyone is gonna have that textbook, let alone know which one you're referring to.
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    (Original post by Kazo11)
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    For part (a), you know that \ell_1 and \ell_2 are tangent to the circle. You also know that they go through R(0,6)

    Let's say that \ell_1: y-6=kx for some k \in \mathbb{R}


    Now the question turns into "For what values of k is the line \ell_1 tangent to the circle C?"

    Can you finish it off?
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    For part 1 you could also differentiate implicitly and go from there
 
 
 
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