Let f (x) = 2x^2+12x-6, give the vertex. hint: use formula -b/2a, y=f (-b/2a)

Anyone know? will mark brainliest if you're correct!

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

What term makes it inconsistent y=2x - 4