Odpowiedź:
[tex](2-5x)^2=2^2-2\cdot2\cdot5x+(5x)^2=4-20x+25x^2\\\\(4a+2)^2=(4a)^2+2\cdot4a\cdot2+2^2=16a^2+16a+4\\\\(3x-7y)^2=(3x)^2-2\cdot3x\cdot7y+(7y)^2=9x^2-42xy+49y^2\\\\(4z-5)^2=(4z)^2-2\cdot4z\cdot5+5^2=16z^2-40z+25\\\\(2\sqrt{3}+1)(2\sqrt{3}-1)=(2\sqrt{3})^2-1^2=4\cdot3-1=12-1=11\\\\(3\sqrt{3}x-2x)^2=(3\sqrt{3}x)^2-2\cdot3\sqrt{3}x\cdot2x+(2x)^2=9\cdot3x^2-12\sqrt{3}x^2+4x^2=\\\\=27x^2-12\sqrt{3}x^2+4x^2=31x^2-12\sqrt{3}x^2[/tex]