Question

hello there!

Answer 1

first convert first parentheses to 1 fraction

x(x+4) + 6(x-4) = x^2 + 4x + 6x - 24
-------------- -----------------
x^2 - 16 x^2 - 16

= x^2 + 10x - 24 = (x + 12)(x - 2)
------------- ------------
x^2 - 16 x^2 - 16

dividing

(x + 12)(x - 2) 2x^2 - 32
------------ * --------
x^2 - 16 3

= (x + 12)(x - 2)(x^2 - 16)
---------------------
3

= (1/3)(x + 12)(x - 2)(x + 4)(x - 4)