1957 AHSME Problems/Problem 10
Solution
This graph generates a parabola, since the degree of is
. The
coordinate of the vertex of a parabola given by
is at
So, the vertex of this parabola is at
Since the coefficient of
is positive, at
, the parabola is at its minimum.
Substituting
, we get
So our answer is
~JustinLee2017