Question

Упростить: $frac{x^{2} + 2x - 3}{x^{2} -1}$ · $frac{4x+4}{x+3}$

Answer 1

(x² + 2x - 3)/(x² - 1) * (4x + 4)/(x + 3) = (x + 3)(x - 1) /(x - 1)(x + 1) * (x + 1)/(x+3) = 4