Question 1063520
Divide by  x+4 using synthetic division.
<pre>
-4    |    1    4    -16    -64
      |         -4   0      64
      |__________________________________
          1    0    -16     0
</pre>


Equation now can be stated  {{{(x+4)(x^2-16)=0}}}


{{{(x+4)(x+4)(x-4)=0}}}


{{{system(x=-4,or,x=4)}}}