(3x-2y)^2= (5x+4y)^2= (7a-3b)^2= (2a+8b)^2=

[latex](3x-2y)^{2}=9 x^{2} -12xy+4 y^{2} [/latex] [latex](5x+4y)^{2}=25 x^{2} +40xy+16 y^{2} [/latex] [latex](7a-3b)^{2}=79 a^{2} -42ab+9 b^{2} [/latex] [latex](2a+8b)^{2}=4 a^{2} +32ab+64 b^{2} [/latex]

1)(3х-2у)^2=9x^2-12xy+4y^2 2)(5х+4у)^2=25x^2+40xy+16y^2 3)(7а-3b)^2=49a^2-42ab+9b^2 4)(2a+8b)^2=4a^2+32ab+64b^2