Samavi16
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I m doing CAIE past papers please reach out at me if you have solved Paper 1- Variant 1 Summer 2019? Please emergency
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GabiAbi84
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If you put the question you’re stuck on in the forum people can try to guide you
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Muttley79
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(Original post by Samavi16)
I m doing CAIE past papers please reach out at me if you have solved Paper 1- Variant 1 Summer 2019? Please emergency
Post the question.
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Samavi16
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Name:  2CEAC41F-4CA9-4B5F-8C17-7062DC8CAD54.jpg.jpeg
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This I can’t understand how to attempt it
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the bear
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the image is not clear, but it is about a line meeting a curve as a tangent.

here is a similar example:

y = ax + b

y = x2 - 3x - 1

where they meet we can say

x2 - 3x - 1 = ax + b

which rearranges to give

x2 -3x -ax -1-b = 0

for a tangent this must have only one (repeated) root....
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Samavi16
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It s screenshot
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Samavi16
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The line 4y=x+c ,where c is a constant,is a tangent to the curve y^2 =x+3 at the point P on the curve.
(i) Find the value of c.
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davros
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(Original post by Samavi16)
The line 4y=x+c ,where c is a constant,is a tangent to the curve y^2 =x+3 at the point P on the curve.
(i) Find the value of c.
Have you looked at the example given by the bear above and tried to follow the logic?
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Samavi16
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(Original post by davros)
Have you looked at the example given by the bear above and tried to follow the logic?
But it s inverse and the marking scheme states that I should use quadratics? I m trying I think I made a mistake
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davros
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(Original post by Samavi16)
But it s inverse and the marking scheme states that I should use quadratics? I m trying I think I made a mistake
What do you mean by "inverse"?

It's an example of a line being tangent to a curve and leads to a quadratic equation, and that requirement implies a certain condition on the roots of the quadratic.
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Samavi16
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I m thinking of another question I m sorry
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davros
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(Original post by Samavi16)
I m thinking of another question I m sorry
So have you managed to sort out the question involving the line being tangent to the curve?
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Samavi16
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Yes thank you for the help
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