How to solve parabolas on a graph

sorry if this answer wrong

Parabolic antenna is a device Digital FTA TV and Radio broadcast receivers that transmit it via satellite as free to air, with this device, the TV signal reception is not affected anymore by the surrounding environment such as trees, mountains and so forth.

Other advantages that we can enjoy with one of these digital devices is the quality of the resulting images and sound, no matter how good the picture and sound produced by analog antenna (antenna UHF and VHF) still can not collate the quality of picture and sound Digital Antenna Parabola. Even now there are parabolic antenna device capable of receiving broadcast digital HDTV (high-definition television)

Her general FTA Digital Satellite dish antenna consists of four main parts:
1. SOLID DISH Parabola
2. LNB (Low Noise Block Converter).
3. DiSCq (Digital Satellite Equipment Control).
4. Receiver DVB (Digital Video Broadcasting) FTA (Free To Air).

Look at the turning point and put the co-ordinated into completed square form then break the brackets .

Example : say the turning point was (4 , 11)

Completed square form : (x +2) ^2 +7

Break the brackets and factorise

X^2 + 4x + 7

Sorry if its wrong