Question

Find the axis of symmetry and the vertex of the graph of y = 3x2 −18x + 17.

x = 3; (3, −10)
x = −3; (−3, −17)
x = 6; (3, −18)
x = −6; (3, −10)

Answer 1

Vertex of y = − 3 x 2 + 18 x − 13 Ans: Vertex (3, 14)

Explanation:

Explanation: x-coordinate of vertex: x = ( − b 2 a ) = − 18 − 6 = 3 y-coordinate of vertex: y = f(3) = -27 + 54 - 13 = 14 x-coordinate of the axis of symmetry is the same as the x-coordinate of the vertex: x = 3