Simplify: fracx2−5x+4x2−3x−4\\frac{x^2 - 5x + 4}{x^2 - 3x - 4}fracx2−5x+4x2−3x−4 (assume xneq4,−1x \\neq 4, -1xneq4,−1).
fracx−1x+1\\frac{x-1}{x+1}fracx−1x+1
fracx+1x−1\\frac{x+1}{x-1}fracx+1x−1
fracx−4x+4\\frac{x-4}{x+4}fracx−4x+4
fracx−1x−4\\frac{x-1}{x-4}fracx−1x−4