a^(2)+b-ab-a" is equal to "

If a^(3) - b^(3) = 210 and a-b = 5 , then ( a+ b)^(2) - ab is equal to :

If a and b are non zero rational unequal numbers, then ((a+b)^(2)-(a-b)^(2))/(a^(2)b-ab^(2)) is equal to :

If a+b=1 , then a^(4)+b^(4)-a^(3)-b^(3)-2a^(2)b^(2)+ab is equal to :

If a^(3) - b^(3)= 210 and a-b=5 , then (a+b)^(2)-ab is equal to :