Simplify: (y+4)(y−4)+(y+4)2(y + 4)(y - 4) + (y + 4)^2(y+4)(y−4)+(y+4)2.
2y2+8y2y^2 + 8y2y2+8y
2y2+8y+162y^2 + 8y + 162y2+8y+16
2y2−162y^2 - 162y2−16
y2+8yy^2 + 8yy2+8y