How do you find square roots of non perfect squares

Write two subtraction equations that are equivalent to 5 + 12 = 17.

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b