Original post by Uxie

Please use this space to create your own questions or ask for help! I'll post miscellaneous maths questions suitable for the AS-level maths specification. You'll be able to answer them no matter what exam board you take.

I'm sure this is well-intentioned, but what usually happens in this forum is that people start their own threads anyway for questions they're struggling with, and then someone (or several people) come on to help

Original post by davros

I'm sure this is well-intentioned, but what usually happens in this forum is that people start their own threads anyway for questions they're struggling with, and then someone (or several people) come on to help

Hi davros, thanks for the reply - I'm well aware of that and there's nothing I can do about that, however I'll post questions anyway seeing as Y12 has just started and there's a chance people would like to practice/ask anything during their academic year.

Differentiation-Power Rule & Tangency

The curve C has equation y = 3x

L is tangent to C at the point with x-ordinate 2.

L has equation y = ax + b where a and b are rational numbers.

Find the coordinate of the point where L crosses the y-axis.

[4 marks]

(Note that ordinate refers to a single x/y value in a coordinate and coordinate refers to a position - in this case in the cartesian x-y plane.)

Answer

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can someone please explain what principle domain is and why the answer is a not c?Maths

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