Answer:
the blank =24x
Step-by-step explanation:
Assuming the expression is x^2 - ________x +144,
you can tell that this is in the form of a^2 +2ab+b^2.
If the "a" is squared, you would get x^2. And if the "b" was squared then you would get b^2.
So as the result, the expression is
(x-12)^2= x^2-24x+144
