Descompunere in factori :

a) 25x la puterea a 2 -10xy +y la puterea a 2=
b)9y la puterea a 2 + 12xy +4x la puterea a 2=
c)18x la puterea a 2 y la puterea a 3 - 24x la puterea a 2 y- 54x la puterea a 3 y la puterea a 3- 48x la puterea a 4 y la puterea a 3

Am nevoie urgent!!!