Kinda lost with this one

Given that
hx^3 - 12x^2 - x + 3=(2x-1) (2x+1) (x-k)

find the values of the constants k and h

don't even know where to start

when the sum of 1.9 and 2.2 is subtracted from the product of 1.9 and 2.2, what is the differance?

don't post ur stuff under my thing!!!!!!!!!!!!!!!!!!!

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