Find Composite Functions
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Where does the 36x come from in this question. I am very confused. My greatest thanks to anyone who can help me

Where does the 36x come from in this question. I am very confused. My greatest thanks to anyone who can help me
The expansion of (9x-2)^2 = 9^2x-2*2*9x+2^2. The middle term, 2*2*9x = 4*9x = 36x.
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