Find the coordinates of the vertex of the following parabola using graphing technology. Write your answer as an (x, y) point.

y = 3x2-12x + 21

The correct answer is b

F(2) = 0f(-2) = 0due to the way the equation is, answers with 0 are correct.

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square