1955 AHSME Problems/Problem 39

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Solution

The least possible value of $y$ is given at the $y$ coordinate of the vertex. The $x$- coordinate is given by \[\frac{-p}{2}\]. Plugging this into the quadratic, we get \[y = \frac{p^2}{4} - \frac{p^2}{2} + q\] \[0 = \frac{p^2}{4} - \frac{2p^2}{4} + q\] $$ (Error compiling LaTeX. Unknown error_msg)0 = \frac{-p^2}{4} + q$ \[q = \frac{p^2}{4} = \boxed{B}\]

~JustinLee2017