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(3-√3)(3+√3)=9-3=6
(2√2-4)(2√2+4)=8-16=-8
(x+2)²=x²+4x+4
(x-3y)²=x²-6xy+9y²
(4-x)²=16-8x+x²
(3x+2y)²=9x²+12xy+4y²
(3+x)(3-x)=9-x²
(7x-y)(7x+y)=49x²-y²
(2x+y)²=4x²+4xy+y²
(6x-5y)²=36x²-60xy+25y²
9-3=6
4-16=-12
x²+4x+4
x²-6xy+9y²
16-8x+x²
9x²12xy+4y²
9-x²
49x²-y²
4x²+4xy+y²
36x²60xy+25y²