a)

${\left(x-1\right)}^2=x^2-2\cdot x\cdot 1+1^2=x^2-2x+1$  

 

b)

${\left(x-3\right)}^2=x^2-2\cdot x\cdot 3+3^2=x^2-6x+9$  

 

c)

${\left(2x-2\right)}^2={\left(2x\right)}^2-2\cdot 2x\cdot 2+2^2=4x^2-8x+4$  

 

d)

${\left(4x-7\right)}^2={\left(4x\right)}^2-2\cdot 4x\cdot 7+7^2=16x^2-56x+49$  

 

e)

${\left(x-3y\right)}^2=x^2-2\cdot x\cdot 3y+{\left(3y\right)}^2=x^2-6xy+9y^2$  

 

f)

${\left(3x-y\right)}^2={\left(3x\right)}^2-2\cdot 3x\cdot y+y^2=9x^2-6xy+y^2$