IGCSE Maths Edexcel A 4MA1

understand that symbols may be used to represent numbers in equations or variables in expressions and formulae

understand that algebraic expressions follow the generalised rules of arithmetic

use index notation for positive and negative integer powers (including zero)

$a × a × a = a^3$

$a^{-5} = \dfrac{1}{a^5}; \quad a^0 = 1$

use index laws in simple cases

$a^m × a^n = a^{m+n}$

$a^m ÷ a^n = a^{m-n}$

$(a^m)^n = a^{mn}$

use index notation involving fractional, negative and zero powers