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If f(x)= 2a|3x – 9| – ax, where a is some constant, find f ′(3).
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If f(x)= 2a|3x – 9| – ax, where a is some constant, find f ′(3).

User Davina Leong
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f(x) = 2a |3x - 9| - ax

f'(x) = 2a |3(0) - 0| - a(1)
f'(x) = 6a - a

f'(x) = 5a
User Gerard Condon
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