Divide: x2−9x+4÷x+3x+4\dfrac{x^2 - 9}{x + 4} \div \dfrac{x + 3}{x + 4}x+4x2−9÷x+4x+3.
x−3x - 3x−3
x+3x + 3x+3
(x−3)(x+3)(x-3)(x+3)(x−3)(x+3)
(x−3)(x+3)(x+3)(x+4)\dfrac{(x-3)(x+3)}{(x+3)(x+4)}(x+3)(x+4)(x−3)(x+3)