<span>Let's say e=a^2−b^2 and take each affirmation:
a. </span><span>both coefficients are perfect squares. </span><span>a could be equal to 2 which is not a perfect square
b. </span><span>there are only two terms - obviously yes </span><span> c. </span>both terms have negative coefficients - as we can see just b has a negative <span>coefficient
Final answer b. </span><span>there are only two terms.</span> <span>