Posted by Sabrina on Tuesday, May 7, 2013 at 10:19pm.
Find the coordinates of the vertex and determine whether the graph opens up or down. y=x^2+x5

Algebra  Steve, Tuesday, May 7, 2013 at 10:39pm
it opens up, because the (x^2) is positive. if it was negative, it would open down. The vertex is as follows:
to find the value of vertex, solve first for when x=o, then when y=0

Algebra  Different Steve, Wednesday, May 8, 2013 at 11:10am
Actually, note that
y=x^2+x5
so it opens downward
y = (x^2  x + 1/4)  5 + 1/4
= (x  1/2)^2  19/4
Now it should be clear where the vertex lies.
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