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(a-b)²=a²-2ab+b²
a)
(x+2y)²=x²+4xy+4y²
b)
(2x-y)²=4x²-4xy+y²
c)
(3x+1/2y)²=9x²+3xy+1/4y²
(x + 2y) (x + 2y) = x² + 2xy + 2xy + 4y² = x² + 4xy + 4y²
b)
(2x - y) (2x - y) = 4x² - 2xy - 2xy + y² = 4x² - 4xy + y²
c)
(3x +1/2y) (3x + 1/2y) = 9x² + 3/2xy + 3/2xy + 1/4y²= 9x² + 3xy + 1/4y²
d)
(2x -1/4y) (2x - 1/4y) = 4x² - 1/2xy - 1/2xy + 1/16y² = 4x² - xy + 1/16y²