ᴡʜɪᴄʜ ᴏғ ᴛʜᴇ ғᴏʟʟᴏᴡɪɴɢ ɪs ᴛʜᴇ ғᴀᴄᴛᴏʀ ᴏғ ×^2 + 6× + 9?​