Week Two - Taite 29th April

Today we looked at substituting numbers into algebraic expressions. When we calculate these numbers we need to follow some rules:

• B - brackets first (inside each bracket use the BEDMAS again)
• E - exponents next (this includes powers and roots)
• DM - division and multiplication go together, if there are both go left to right
• AS - adding and subtracting go together, if there are both go left to right
• Always put brackets around the top and bottom of a fraction
• Always put brackets around a negative number if it has an exponent.
  

e.g. if a = 3, b= 4 and c = -1 then

a) a + b = 3 + 4 = 7
b) 6c = 6 x -1 = -6
c) 2(b+c) = 2 x (4 + -1) = 2 x 3 = 6
d) c^2 = (-1)^2 = 1

Homework: 7.04