Introduction Flashcards
1
Q
Variable
A
Placeholder
2
Q
Natural
A
All positive whole numbers
3
Q
Integer
A
All whole numbers
Represented with Z
4
Q
Rational
A
m/n (fractions)
with m and n being integer and n not being 0.
Represented with Q
5
Q
Real
A
Distance between points of a number line (all possible REAL numbers).
Represented with R
6
Q
Adding + or - or nonneg to number representations
A
R+ denotes all real numbers that are positive, R- means all that are negative, Rnonneg means no negatives.
7
Q
a/b + c/d
A
ad/bd + bc/bd = ad+bc/bd
8
Q
a/b * c/d
A
ac/bd
9
Q
a/b * c/d
A
ad/bc
10
Q
a^b*a^c
A
a^b+c
11
Q
(a^b)^c
A
a^b*c
12
Q
Factorisation (AC Method)
A
x^2 + 3x + 2
a = 1
b = 3
c = 2
ac = 21 = 2
Find factors of 2 which can be added to make 3
If a*c was 28, and b was 16, it would be 14 and 2
In this case:
2 + 1 = 3
2 * 1 = 2
So (x + 1)(x+2)
