Question: Finding equations of 4 Lines

Let f(x) = x3+9x2-9x-1/x4+1

Find the equations of the 4 lines having slope 0.5 that are tangent to the graph of 𝑓(𝑥) (first find the values of 𝑥 where 𝑓 ′(𝑥) = 0.5).

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