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Last edited by aryanb16; 1 month ago
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1 month ago
#2
what bit are you finding difficult?
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1 month ago
#3
(Original post by aryanb16)
The whole thing really , it’s only 4 marks so i don’t think you have to differentiate.
Have you covered the discriminant yet?
Last edited by flaurie; 1 month ago
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1 month ago
#4
Yea quickest and easiest method to solve this question is using the discriminant
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1 month ago
#5
(Original post by aryanb16)
Yes, but im not sure how to use it with this question as Ive only seen it with quadratics
Start by substituting the y=ax+b into the equation of a circle...group like terms together and use the discriminant
Last edited by Faith&hardwork; 1 month ago
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1 month ago
#6
the discriminant must = 0 if the line is a tangent to the circle
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