Answer:
25 m^2 -20mn +4n^2
Step-by-step explanation:
(5m-2n)²
(5m-2n)(5m-2n)
FOIL
first 5m*5m = 25m^2
outer 5m*-2n = -10mn
inner -2n * 5m = -10mn
last -2n * -2n = 4n^2
Add together
25m^2 -10mn -10mn + 4n^2
