6-5 additional practice properties of special parallelograms the answers are online somewhere i just cant find them help ASAP pls!

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

What are “like terms”? why can we only add like terms?

Can any one me with the answers to these questions asap?