You subtract the second indice from the first.
NEGATIVES
a) DEAL WITH NEGATIVES
(2/5)-3=FLIP(5/2)3=EXPAND 5/2 x 5/2 x 5/2= 125/8
125/8=5 3/2 3 125/8=5 3/2 3
2ax2b=2a+b
2c//2d=2c-d
(// = divide)
Indices L8
Annotations:
RULE: (na)b=naxb
ex/
(2 3)4=(2)12
RULE:(n/m)a=na/m
ex/
(7 3)2=(7)6
ALGEBRA
n a x n b=n a+b
Quadratic sequences L7
Annotations:
If the second sequence is common, it is quadratic! It contains an n2 term.
4 7 12 19 28
^ ^ ^ ^
3 5 7 9 first
^ ^ ^
2 2 2 second
4 7 12 19 28
1 2 3 4 5 term n
1 4 9 16 25 term n2
3 3 3 3 3 n2+3
Congruence
Annotations:
1) The three sides of each triangle are equal (SSS)
2)Two sides are the Inclided angles are equal (SAS)3) Two angles and a corresponding side are equal (AAS)4)Each triangle contains a right angle, and the HYPOTENUSES and the another side are equal.
(RHS rule: Right-angled, Hypotenuse, side)