, vertex .
gives you and therefore so that .
gives you and .
gives you .
gives you .
gives you and .
gives you or so that .
with , there are no solutions.
gives you and therefore .
gives you .
gives you and therefore .
and , no solutions.
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gives you vertex .
gives you .
Also, the graph of is a straight line if . Then it also has precisely one point in common with the -axis.
If and therefore for
gives you .
gives you and this means .
There is also one intersection point if .