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So, subtraction and multiplication of polynomials, in this case, we should multiply the last two polynomials first before subtracting it from the minuend.

(4xy)² - (6xy + 7) (3xy - 8)

= (4²x²y²) - 18x²y² - 27xy - 56
= 16x²y² - 18x²y² - 27xy - 56
= -2x²y² - 27xy - 56
Isn't it +27xy+56?
There is a minus that change them into +27xy and +56
Oh yeah, sorry, thank you so much, you are great!
It should be -2x^2y^2 + 27xy + 56