The left hand side of the equation is a difference of two squares and may be factored out as follows,
(x - 4)(x + 4) > 0
They may be individually taken as,
x - 4 > 0 ; x > 4
x + 4 > 0 ; x < -4
Thus, the answer to this item is letter A.
WHAT IS THIS LANGUAGE ? PLEASE TRY TO USE ENGLISH !
-9d = 63
you divide both side by -9
sooo...
d = -7
