Question 739310
{{{
 4(x+2)^2+320=0
}}}


{{{
 (x+2)^2=-320/4
}}}


Square rooting both sides then subtracting 2 (from both sides) leads to


{{{
x-2+2*i*sqrt(5)
}}}


or 


{{{
x=-2-2*i*sqrt(5)
}}}