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Higher Maths COMMUNICATION MARKS

These marks are really important and can be the difference between passing and failing, or getting a B instead of a C.

So post examples of when you would include a comment to gain a mark, and maybe someone will comment one that you weren't aware of!

E.g. Mtgt = 4 (since -1/4 x 4 = -1)

So go ahead, you might help someone pass or improve their grade, and someone may help improve yours! :smile:

Reply 1

mimx

I don't think you gain marks for comments like that one though. State one gradient and then say so (or implies symbol) gradient of tangent equals, no need to explain why.

E.g.:

m_{AB} = -2 ~~~~ \Rightarrow ~~~~ m_{tangent} = \frac{1}{2}

Ought to be fine.

(edited 11 years ago)

Reply 2

aroy45

-1<a<1 so a limit exists is always important.
Dy/Dx = gradient function
Dy/Dx = 0 for stationary points
m1xm2= -1 for perp lines
m1=m2 for parallel lines
After synthetic division to prove a factor always write 0=f(1) so (x-1) is a factor. Obviously it isn't always 1.
Dot Product = 0 for perpendicular vectors
Parallel vectors have equal components
b^2-4ac=0/>0/<0 to define roots.

We called them star statements :P

Reply 3

auberjean

And when proving points are collinear you HAVE to specify which point is in common (a friend of mine lost one mark in the unit 3 NAB for that, haha).

e.g.
"Since AB> is parallel to BC> and point B is in common, A, B and C are collinear"

Reply 4

member592149

I'd say just to write down as much working as possible. And lets say you are doing a vectors question and it asks you to find a point by interpreting a diagram and you can't work it out for 1 mark, sometimes just guess it if it's needed for the rest of the question. This shows you atleast know what you are doing, despite getting the wrong coordinate.