Answer:
25d^2-40dy+16y^2
Step-by-step explanation:
(5d-4y)^2
many make tehmistake and do this:
25d^2 - 16y^2
THIS IS WRONG
you must FOIL
(5d-4y)(5d-4y)
25d^2 - 20dy - 20dy + 16 y^2
25d^2 - 40dy + 16 y^2
