If using the method of completing the square to solve the quadratic equation 2? -+2 - 24 = 0, which number would have to be added to "complete the square?

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7