AN N1/L2.4
Evaluate expressions and make substitutions in given formulae in words and symbols to produce results (a) Understand that words and symbols in expressions and formulae represent variable quantities (numbers), not things (i.e. 2a + 2b cannot be explained as 2 apples and 2 bananas) (b) Understand that the contents of brackets must be worked out first (c) Understand that, when there is no operator between a number and a variable, or two variables, multiplication is implied, e.g. 2a = 2 x a; ab = a x b; 2ab = 2 x a x b (d) Understand that, when there is no operator between a number and a bracket, multiplication is implied, e.g. 2 (a + b) = 2 x (a + b)