Question

Find the vertex of the graph of the function.
f(x) = 2x2 - 8x + 9

Answer 1

(2, 1).

Explanation:

f(x)=2x^2-8x+9

Find -b/2a first, it's -(-8)/2(2)=8/4=2.

Then find the y-coordinate of the vertex.

2(2)^2-8(2)+9=2(4)-16+9=8-16+9=-8+9=1