Sagot :
This is a special product with the form:
(a-b)² = a²-2ab+b²
So:
(3-4m) = 9-24m+16m²
(a-b)² = a²-2ab+b²
So:
(3-4m) = 9-24m+16m²
You have to perform FOIL Method in order to get to the correct answer. That then results to 16m^2 - 24m + 9.