Which equation is y = –6x2 + 3x + 2 rewritten in vertex form?

Can someone me out here and the tell me the greatest common factor

We just started the introduction into circles and i have no idea how to do this.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm