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higher maths

could someone help me as soon as possible with this question

find the possible values of k for which the line x-y=k is a tangent tothe circle x^+y^=18
Original post by catmandoo
could someone help me as soon as possible with this question

find the possible values of k for which the line x-y=k is a tangent tothe circle x^+y^=18


Pretend it's a normal question, so get x=y+kx = y + k and sub it into the circle equation (which I assume is meant to be x2+y2=18x^2 + y^2 = 18). Once you get a quadratic equation in the form ax2+bx+cax^2 + bx + c (and remember c can be k and a number), stop. You then need to use b2−4acb^2 - 4ac. Tell me if you need more help.
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catmandoo
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got it earlier n done it thanks anyway

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