Maths Paper 1 help needed:)Watch
This I can’t understand how to attempt it
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....
(i) Find the value of c.
But it s inverse and the marking scheme states that I should use quadratics? I m trying I think I made a mistake
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.