Factorise each of these functions and then sketch the graph of each function indicating clearly the axi

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Factorise each of these functions and then sketch the graph of each function indicating clearly the axi intercepts.

a. y = 9x – x3

b. y = x3 + 4x2 + x – 6

c. y = 2x3 + x2 – 25x + 12

d. y = 2x3 + 3x2 – 29x - 60

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