How do you factor quadratic expressions with coefficient and without c?

Explanation is in the file

https://cutt.ly/wzdvC7R

Completing the square. I mean, you can, for some values of a and b, but it's not going to help much if it is messy. Nope!

Factoring. Yes. It's really easy since there is an obvious common factor.

Square root theorem. No idea what this is. And I don't know how it would help.

Quadratic equation. This works, but is a little long for what you have to do.\

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

brainliest