Please help for the love of god

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

The verbal translation for the difference of m and 7 increased by 15

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