Answer: x^2 - 24x + 144
Explanation:
Recall that multiplying the numerator and denominator of a fraction by the same thing does not change the value of the fraction (ex. 3/4 x 1/1 = 3/4).
In this case, you can see that the denominator was mutliplied by (x-12):
(x+12)(x-12) = x^2-144
Therefore, all we need to do is multiply the numberator by (x-12):
(x-12)(x-12) = x^2 - 24x + 144