Ceciliavaladez40ask Ceciliavaladez40ask Matemáticas contestada X^2+ 4 = (X + 1)(X + 3) X = (20 - X) + 4 2X – 3(-4X + 5) = 7 + 2(3X + 9) 2(3X + 3) – 4(5X – 3) = X(X – 3) – X(X + 5) 5X – 3(X – 4) = 4(X + 2) + 2(9 – 2X)