Question

Copiati si completati:
a) (........+3x)²=......+12xy+......;
b) (........-2a)²=......-16ab+.......;
c) (4x+........)²=.......+4xy........;
d) (3a-.......)²=.......-4ab+........;

Answer 1

a) (2y + 3x)^2 = 4y^2 + 12xy + 9x^2
b) (4b-2a)^2 = 16b^2 - 16ab + 4a^2
c) (4x + y/2)^2 = 16x^2 + 4xy + 1/4*y^2
d) (3a - 2/3*b)^2 = 9a^2 - 4ab + 4/9 * y^2

Answer 2

a) (......+3x)²=.......+12xy+.....
(2y+3x)²=4y²+12xy+9x²

b) (......-2a)²=......-16ab+.....
(4b -2a)²= 16b²-16ab+4a²

c) (4x+......)²=......+4xy+......
(4x+$\frac{y}{2}$)²=16x²+4xy+$\frac{1}{4}$y²

d) (3a-......)²=........-4ab+......
(3a-$\frac{2}{3}$b)²=9a²-4ab+$\frac{4}{9}$b²