How to factor out a gcf for 8a^2+16=0

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth

The coordinates of vortex a’ are (8,4) (-4,2) (4,-,4) the coordinates of vortex b’ are (6,6)(12,-,12)(12,12) the coordinates of vortex c’ are(-2,,12)(4,12)(12,-4)

What is the value of x? enter your answer in the box.