Question

calcule (a−5y)2=
(x-y)2=
(3y+8)2=

Answer 1

(a−5y)2= a² -2.a.5y + (5y)² = a²-10ay+25y²

(x-y)2= x² -2xy +y²

(3y+8)2= (3y)²+2.3y.8 +8² = 9y²+48y+64