4x^2 - 16x/x^2 - 16 *
x^2 + 2x -8/3x^3 + 6x^2
factor 4x from the numerator, and factor the denominator as the difference of two squares.
On the second, factor 3x^2 from the denominator, and then factor the numerator.
x^2 + 2x -8/3x^3 + 6x^2
On the second, factor 3x^2 from the denominator, and then factor the numerator.