recognise and determine features of the graphs of 𝑦=𝑥^3,𝑦=𝑎(𝑥−𝑏)^3+𝑐 and 𝑦=𝑘(𝑥−𝑎)(𝑥−𝑏)(𝑥−𝑐), including shape, intercepts and behaviour as 𝑥→∞ and 𝑥→−∞