Difference of squares: Complete the missing numbers

Fill in the missing element to obtain a true expression:

$(x+_—)\cdot(x-_—)=x^2-121$

11

Fill in the missing element to obtain a true expression:

$(_—+3)\cdot(_—-3)=x^2-9$

$x$

Fill in the missing element to obtain a true expression:

$x^2-64=(x-_—)(_—+x)$

8

Fill in the missing element to obtain a true expression:

$x^2-49=(x-_—)\cdot(x+_—)$

7

$x^2-6=(x-_—)\cdot(x+_—)$

$\sqrt{6}$

Fill in the missing element to obtain a true expression:

$x^2-36=(x-_—)\cdot(_—+x)$

6

Fill in the missing element to obtain a true expression:

$2x^2-_{_—}=2(x-4)\cdot(x+4)$

32