If using the method of completing the square to solve the quadratic equation x^2-11x-38=0x, which number would have to be added to "complete the square"?

Ithink it’s a as the answer.

The sum of the angles in a triangle is 180°. this is called the angle-sum property.the sum of the lengths of any two sides of a triangle is greater than the length of the third side. similarly, the difference between the lengths of any two sides of a triangle is less than the length of the third side.the side opposite to the largest angle is the longest side of the triangle and the side opposite to the smallest angle is the shortest side of the triangle.