Someone help me Please-

Sorry guys but as you have a small brain

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

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?