a(-2,6) b(-2,4)
1)a+b=(-2,6)+(-2,4)=(-4,10)
2)a-b=(-2,6)-(-2,4)=(-2,6)+(2,-4)=(0,2)
3)b-a=(-2,4)-(-2,6)=(-2,4)+(2,-6)=(0,-2)
4)-a-b= -(-2,6)-(-2,4)= (2,-6)+(2,-4)=(4,-10)
a(-2,6) b(-2,4)
1)a+b=(-2,6)+(-2,4)=(-4,10)
2)a-b=(-2,6)-(-2,4)=(-2,6)+(2,-4)=(0,2)
3)b-a=(-2,4)-(-2,6)=(-2,4)+(2,-6)=(0,-2)
4)-a-b= -(-2,6)-(-2,4)= (2,-6)+(2,-4)=(4,-10)