Respuesta :

irspow
(x+4)(x-4)=9  expand left side by performing indicated multiplication...

x^2-16=9 add 16 to both sides

x^2=25  take the square root of both sides...

x=±5

x=-5 and 5

So the answer would be the bottom choice.
phillipino2002
the answer is 
x=5 and x=-5