C1 Flashcards
1
Q
<
E.g. x
A
Below x axis
2
Q
>
E.g. x>2
A
Above x axis
3
Q
Midpoint formula
A
(x1 + x2) / 2
(y1 + y2) / 2
4
Q
Length of AB
A
Root (x2 - x1)^2 + (y2 - y1)^2
5
Q
Delta > 0
A
2 distinct roots
6
Q
Delta = 0
A
2 equal roots
7
Q
Delta < 0
A
No roots
8
Q
Delta =
A
b^2 - 4ac
9
Q
Gradient =
A
m = (y2 - y1) / (x2 - x1)
10
Q
0/2
A
0
11
Q
2/0
A
Infinity
12
Q
Equation of a straight line:
A
y - y1 = m(x - x1)
13
Q
Circle with centre (0,0)
A
x^2 + y^2 = r^2
14
Q
Circle with centre (a,b)
A
(x-a)^2 + (y-b)^2 = r^2
