a: A=(3x+5)(2x-7)
=6x^2-21x+10x-35
=6x^2-11x-35
b: (x^2-xy+y^2)(x+y)=x^3+y^3
a: A=(x-7)(x-5)=x^2-5x-7x+35=x^2-12x+35
b: A=(x^2-2x+1)(x-1)
=(x-1)^2*(x-1)
=(x-1)^3
=x^3-3x^2+3x-1
a: 4(x-1)(x+1)
=4(x^2-1)
=4x^2-4
b: (x+3)(x^2+3x-5)
=x^3+3x^2-5x+3x^2+9x-15
=x^3+6x^2+4x-15
a: (xy-1)(xy+5)
=x^2y^2+5xy-xy-5
=x^2y^2+4xy-5
b: (x^2-2x+3)(x-5)
=x^3-5x^2-2x^2+10x+3x-15
=x^3-7x^2+13x-15
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x2y(2x3 - 
xy2 - 1); 
x(1,4x - 3,5y);
x2 - 
xy + 
y2);