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[Maximum mark: 5]

The curves y=x4−12x+k and y=20x−2k are tangent.

Find the possible value(s) of k.

[5]

k=

[Maximum mark: 5]

The curves y=x4−12x+k and y=20x−2k are tangent.

Find the possible value(s) of k.

[5]

k=