Question

Find the vertex of the parabola by completing the square.

x^2 - 6x + 8 = y

A. (–3,– 6)

B. (3,–1)

C. (–3,1)

D. (–1, 3)

A, B, C, or D? Please explain :)

Answer 1

first coordinate of the vertex is \(-\frac{b}{2a}\) which in your case is \(-\frac{-6}{2\times 1}=3\) second coordinate is what you get when your replace \(x\) by \(3\)

Answer 2

Thanks for the explanation you got any idea on the answer? What's your point of view on that?

Answer 3

3^2-6(3)+8 = ...