Please help with this one, the highlighted one is wrong

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

Can you me find the missing length. i attached an image.