Simplify the expression: x2−11x+28x2−16\frac{x^2 - 11x + 28}{x^2 - 16}x2−16x2−11x+28
x−7x+4\frac{x-7}{x+4}x+4x−7
x−7x−4\frac{x-7}{x-4}x−4x−7
x+7x−4\frac{x+7}{x-4}x−4x+7
x+7x+4\frac{x+7}{x+4}x+4x+7