Differentiate the following equation, y = x^9 + 3x^2 + x^(-1)

dy/dx = 9x8 + 6x - x-2

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(a)Show that the lines y=3x+7 and 2y–6x=8 are parallel. [3 marks] (b) Is the point (–5, –6) above, below or on the line y = 3x + 7 ? Do not use a graphical method. [2 marks] [Total 5 marks]


Factorise and solve (x^2) - 8x + 15 = 0.


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