Question

hi guys
pls help me.......​

Answer 1

Answer:

Q. (5-y)

coefficient of Y is -1

Answer 2

(5-y)^2

=(5)^2 - 2×(5)×(y) + (y)^2 ____(a - b)^2 = a^2 -2ab +b^2

=25-10y+y^2.