Преобразуйте многочлен(5z+z)^2 (a-4)^2 (5-2y)^2 (b-1/3)^2

1) (5z+z)²=(6z)²=36z². 2) (a-4)²=a²-2a·4+4²=a²-8a+16. 3) (5-2y)²=5²-2·5·2у+(2у)²=25-20у+4у². 4) (b- [latex] \frac{1}{3} [/latex] )²=b²-2b· [latex] \frac{1}{3} [/latex] +( [latex] \frac{1}{3} [/latex] )²=b²-  [latex] \frac{2}{3} [/latex] b+ [latex] \frac{1}{9} [/latex].