Answer :

(3x-4)² is
(3x-4)(3x-4)
FOIL it.
9x²+3x-4+3x-4+16
simplify
9x²+6x+8


so you just write it out as (3x-4)(3x-4) and then you FOIL, which would give you 9x^2-24x+16

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