If a+b+c=1 and a^3+b^3+c^3=16 solve the value of the following expression: ab(a+b)+bc(b+c)+ca(c+a)+2abc

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42