1.
a) (x+4)²=x²+8x+4²=x²+8x+16
b) (y+3)²=y²+6y+3²=y²+6y+9
c) (2x+1)²=2x²+4x+1²=2x²+4x+1
d) (3y+2)²=3y²+12y+4
e) (x+2y)²=x²+4xy+2y²
2.
a) (x-2)²=x²-4x+4
b) (a-1)²=a²-2a+1
c) (4-b)²=16-8b-b²
d) (5-2c)²=25-50c-2c²
e) (2a-b)²=2a²-4ab-b²
3.
a) (x+2)(x-2)=x²-4
b) (a+3)(a-3)=a²-9
c) (5+x)(5-x)=25-x² ...
